DCM3623x50T13A6y7z Datasheet by Vicor Corporation

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n VICOR ‘ an @Ice VICOR
CUS
®
DCMDC-DC Converter
Isolated, Regulated DC Converter
DCM3623x50T13A6y7z
Features & Benefits
Isolated, regulated DC-DC converter
Up to 160 W, 13.40 A continuous
91.5% peak efficiency
436 W/in3Power density
Wide input range 9 – 50 Vdc
Safety Extra Low Voltage (SELV) 12.0 V Nominal Output
2250 Vdc isolation
ZVS high frequency switching
n
Enables low-profile, high-density filtering
Fully operational current limit
OV, OC, UV, short circuit and thermal protection
3623 through-hole ChiP package
n1.524” x 0.898” x 0.284”
(38.72 mm x 22.8 mm x 7.21 mm)
Typical Applications
Industrial
Process Control
Transportation / Heavy Equipment
Defense / Aerospace
Product Description
The DCM Isolated, Regulated DC Converter is a DC-DC
converter, operating from an unregulated, wide range input to
generate an isolated 12.0 Vdc output. With its high frequency
zero voltage switching (ZVS) topology, the DCM converter
consistently delivers high efficiency across the input line range.
Modular DCM converters and downstream DC-DC products
support efficient power distribution, providing superior power
system performance and connectivity from a variety of
unregulated power sources to the point-of-load.
Leveraging the thermal and density benefits of Vicor’s ChiP
packaging technology, the DCM module offers flexible thermal
management options with very low top and bottom side
thermal impedances. Thermally-adept ChiP based power
components enable customers to achieve cost effective power
system solutions with previously unattainable system size,
weight and efficiency attributes, quickly and predictably.
Product Ratings
VIN = 9 V to 50 V POUT = 160 W
VOUT = 12.0 V
(7.2 V to 13.2 V Trim) IOUT = 13.40 A
S
NRTL
CUS
Part Ordering Information
Product
Function
Package
Size
Package
Type
Max
Input
Voltage
Range
Ratio
Max
Output
Voltage
Max
Output
Power
Temperature
Grade Option
DCM 36 23 x 50 T 13 A6 y 7z
DCM =
DC-DC
Converter
Length
in mm
x 10
Width
in mm
x 10
T =
Through hole
ChiPs
Internal Reference T = -40°C – 125°C
M = -55°C – 125°C
70 = Enhanced VOUT
Regulation / Analog
Control Interface Version
DCMDC-DC Converter Rev 1.0
Page 1 of 23 12/2017
DCM VICOR
DCMDC-DC Converter Rev 1.0
Page 2 of 23 12/2017
Vin
Load 1
Non-isolated
Point-of-Load
Regulator
R1
L1
C1
L2
C
OUT-EXT
TR
EN
FT
+IN +OUT
-IN -OUT
DCM
Load 2
F1
Typical Application
Typical Application: Single DCM3623x50T13A6y7z, to a non-isolated regulator, and direct to load
DCM3623x50T13A6y7z
TOP VIEW VICOR
12
A
B
C
D
ED’
C’
B’
+IN +OUT
TOP VIEW
3623 ChiP Package
A
FT
EN
+OUT
-OUT
-OUT-IN
TR
Pin Configuration
Pin Descriptions
Pin
Number Signal Name Type Function
A1 +IN INPUT POWER Positive input power terminal
B1 TR INPUT Enables and disables trim functionality. Adjusts output voltage when trim active.
C1 EN INPUT Enables and disables power supply
D1 FT OUTPUT Fault monitoring
E1 -IN INPUT POWER
RETURN Negative input power terminal
A’2, C’2 +OUT OUTPUT POWER Positive output power terminal
B’2, D’2 -OUT OUTPUT POWER
RETURN Negative output power terminal
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 3 of 23 12/2017
(W) 3 5 Maximum Output anv 150 140 120 D 25 so 75 Inn 125 150 Temperature (-0) Top only at lampfimlurl Top and bad: at ramp-mum Tap. leads and belly at temperature Output Voltage (V) sanctum 14 13— 12 11 w 2.6 4.6 6.6 8.6 10.6 12.6 14.6 Average Output Current (A) — Law Trim Nam Trim —ngh Trim VICOR
Absolute Maximum Ratings
The absolute maximum ratings below are stress ratings only. Operation at or beyond these maximum ratings can cause permanent damage to the device.
Electrical specifications do not apply when operating beyond rated operating conditions.
Parameter Comments Min Max Unit
Input Voltage (+IN to –IN) -0.5 65.0 V
Input Voltage Slew Rate -1 1 V/µs
TR to - IN -0.3 3.5 V
EN to -IN -0.3 3.5 V
FT to -IN -0.3 3.5 V
5 mA
Output Voltage (+Out to –Out) -0.5 15.6 V
Dielectric withstand (input to output) Basic insulation 2250 Vdc
Internal Operating Temperature T Grade -40 125 °C
M Grade -55 125 °C
Storage Temperature T Grade -40 125 °C
M Grade -65 125 °C
Average Output Current 22.0 A
Figure 2 Electrical Specified Operating Area
Figure 1 Thermal Specified Operating Area: Max Output Power
vs. Case Temp, module at minimum full load efficiency
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 4 of 23 12/2017
mw‘é D D VICOR
Electrical Specifications
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range of -40°C < TINT < 125°C for T grade and -55°C < TINT < 125°C for M grade.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Power Input Specification
Input voltage range VIN Continuous operation 9 30 50 V
Inrush current (peak) IINRP With maximum COUT-EXT
, full resistive load 25.0 A
Input capacitance (internal) CIN-INT Effective value at nominal input voltage 28.6 µF
Input capacitance (internal) ESR RCIN-INT At 1 MHz 0.39 mΩ
Input inductance (external) LIN Differential mode, with no further line bypassing 1µH
No Load Specification
Input power – disabled PQ
Nominal line, see Fig. 3 0.5 1.0 W
Worst case line, see Fig. 3 1.5 W
Input power – enabled with no load PNL
Nominal line, see Fig. 4 1.3 3.4 W
Worst case line, see Fig. 4 4.6 W
Power Output Specification
Output voltage set point VOUT-NOM 11.94 12.0 12.06 V
Rated output voltage trim range VOUT-TRIMMING
Trim range over temp, with > 10% rated load.
Specifies the Low, Nominal and High Trim conditions. 7.2 12.0 13.2 V
Output voltage light load regulation ΔVOUT-LL
0% to 10% load, additional VOUT relative to VOUT
accuracy; see Fig. 5 and Sec. Design Guidelines -0.00 2.53 V
VOUT accuracy %VOUT-ACCURACY
The total output voltage setpoint accuracy from the
calculated ideal VOUT based on trim. Excludes ΔVOUT-LL
-1.0 1.0 %
Rated output power POUT Continuous, VOUT 12.0 V 160 W
Rated output current IOUT Continuous, VOUT 12.0 V 13.40 A
Output current limit IOUT-LM
Of rated IOUT max. Fully operational current limit, for
nominal trim and below 100 120 150 %
Current limit delay tIOUT-LIM The module will power limit in a fast transient event 1 ms
Efficiency η
Full load, nominal line, nominal trim 90.8 91.5 %
Full load, over line and temperature, nominal trim 88.9 %
50% load, over rated line, temperature and trim 86.0 %
Output voltage ripple VOUT-PP
20 MHz bandwidth. At nominal trim, minimum COUT-EXT and
at least 10 % rated load 420 mV
Output capacitance (internal) COUT-INT Effective value at nominal output voltage 123 µF
Output capacitance (internal) ESR RCOUT-INT At 1 MHz 2.900 mΩ
Output capacitance (external) COUT-EXT
Excludes component temperature coefficient For load
transients that remain > 10% rated load 1000 10000 µF
Output capacitance (external) COUT-EXT-TRANS
Excludes component temperature coefficient For load
transients down to 0% rated load, with static trim 10000 10000 µF
Output capacitance (external) COUT-EXT-
TRANS-TRIM
Excludes component temperature coefficient For load
transients down to 0% rated load, with dynamic trimming 10000 10000 µF
Output capacitance, ESR (ext.) RCOUT-EXT At 10 kHz, excludes component tolerances 10 mΩ
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 5 of 23 12/2017
VICOR
Electrical Specifications (cont.)
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range of -40°C < TINT < 125°C for T grade and -55°C < TINT < 125°C for M grade.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Power Output Specifications (Cont.)
Initialization delay tINIT See state diagram 25 40 ms
Output turn-on delay tON
From rising edge EN, with VIN pre-applied. See timing
diagram 200 µs
Output turn-off delay tOFF From falling edge EN. See timing diagram 600 µs
Soft start ramp time tSS At full rated resistive load, with min COUT-EXT
. 31 ms
VOUT threshold for max
rated load current VOUT-FL-THRESH
During startup, VOUT must achieve this threshold before
output can support full rated current 6.0 V
IOUT at startup IOUT-START
Max load current at startup while VOUT
is below VOUT-FL_THRESH
1.33 A
Monotonic soft-start threshold
voltage VOUT-MONOTONIC
Output voltage rise becomes monotonic with 10% of
preload once it crosses VOUT-MONOTONIC
6.0 V
Minimum required disabled duration tOFF-MIN
This refers to the minimum time a module needs to be
in the disabled state before it will attempt to start via EN 2ms
Minimum required disabled duration
for predictable restart tOFF-MONOTONIC
This refers to the minimum time a module needs to be in
the disabled state before it is guaranteed to exhibit
monotonic soft-start and have predictable startup timing
100 ms
Voltage deviation (transient) %VOUT-TRANS
Minimum COUT_EXT (10 90% load step).
<10 %
Settling time tSETTLE 9.6 ms
Powertrain Protections
Input Voltage Initialization threshold VIN-INIT Threshold to start tINIT delay 6V
Input Voltage Reset threshold VIN-RESET Latching faults will clear once VIN falls below VIN-RESET 3V
Input undervoltage lockout threshold VIN-UVLO- 5.40 8.55 V
Input undervoltage recovery threshold VIN-UVLO+ See Timing diagram 9.00 V
Input overvoltage lockout threshold VIN-OVLO+ 55 V
Input overvoltage recovery threshold VIN-OVLO- See Timing diagram 50 V
Output overvoltage threshold VOUT-OVP From 25% to 100% load. Latched shutdown 15.00 V
Output overvoltage threshold VOUT-OVP-LL From 0% to 25% load. Latched shutdown 15.60 V
Minimum current limited VOUT VOUT-UVP Over all operating steady-state line and trim conditions 4.49 V
Overtemperature threshold (internal) TINT-OTP 125 °C
Power limit PLIM 320 W
VIN overvoltage to cessation of
powertrain switching tOVLO-SW Independent of fault logic 2.3 µs
VIN overvoltage response time tOVLO For fault logic only 200 µs
VIN undervoltage response time tUVLO 100 ms
Short circuit response time tSC Powertrain on, operational state 200 µs
Short circuit, or temperature fault
recovery time tFAULT See Timing diagram 1 s
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 6 of 23 12/2017
Signal Specifications
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range of -40°C < TINT < 125°C for T grade and -55°C < TINT < 125°C for M grade.
Enable: EN
The EN pin enables and disables the DCM converter; when held low the unit will be disabled.
• The EN pin has an internal pull-up to VCC and is referenced to the -IN pin of the converter.
SIGNAL TYPE STATE ATTRIBUTE SYMBOL CONDITIONS / NOTES MIN NOM MAX UNIT
DIGITAL
INPUT Any
EN enable threshold VENABLE-EN 2.31 V
EN disable threshold VENABLE-DIS 0.99 V
Internally generated VCC VCC 3.21 3.30 3.39 V
EN internal pull up
resistance to VCC
RENABLE-INT 9.9 10.0 10.1 kΩ
Trim: TR
The TR pin enables and disables trim functionality when VIN is initially applied to the DCM converter.
When Vin first crosses VIN-UVLO+, the voltage on TR determines whether or not trim is active.
If TR is not floating at power up and has a voltage less than TR trim enable threshold, trim is active.
• If trim is active, the TR pin provides dynamic trim control with at least 30Hz of -3dB control bandwidth over the output voltage of the DCM converter.
• The TR pin has an internal pull-up to VCC and is referenced to the -IN pin of the converter.
SIGNAL TYPE STATE ATTRIBUTE SYMBOL CONDITIONS / NOTES MIN NOM MAX UNIT
DIGITAL
INPUT Startup
TR trim disable threshold VTRIM-DIS
Trim disabled when TR above this threshold
at power up 3.20 V
TR trim enable threshold VTRIM-EN
Trim enabled when TR below this threshold
at power up 3.15 V
ANALOG
INPUT
Operational
with Trim
enabled
Internally generated VCC VCC 3.21 3.30 3.39 V
TR pin functional range VTRIM-RANGE 0.00 2.46 3.16 V
VOUT referred TR
pin resolution VOUT-RES With VCC = 3.3 V 15 mV
TR internal pull up
resistance to VCC
RTRIIM-INT 9.9 10.0 10.1 kΩ
Fault: FT
The FT pin is a Fault flag pin.
When the module is enabled and no fault is present, the FT pin does not have current drive capability.
• Whenever the powertrain stops (due to a fault protection or disabling the module by pulling EN low), the FT pin output Vcc and provides current to drive
an external ciruit.
• When module starts up, the FT pin is pulled high to VCC during microcontroller initialization and will remain high until soft start process starts.
SIGNAL TYPE STATE ATTRIBUTE SYMBOL CONDITIONS / NOTES MIN NOM MAX UNIT
DIGITAL
OUTPUT
Any FT internal pull up
resistance to VCC
RFAULT-INT 494 499 504 kΩ
FT Active
FT voltage VFAULT-ACTIVE At rated current drive capability 3.0 V
FT current drive capability IFAULT-ACTIVE
Over-load beyond the ABSOLUTE MAXIMUM
ratings may cause module damage 4mA
FT response time tFT-ACTIVE
Delay from cessation of switching to
FT Pin Active 200 µs
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 7 of 23 12/2017
High Level Functional State Diagram
Conditions that cause state transitions are shown along arrows. Sub-sequence activities listed inside the state bubbles.
LATCHED
FAULT
Powertrain: Stopped
FT = True
STANDBY
Powertrain: Stopped
FT = True
Application of
VIN
INITIALIZATION
SEQUENCE
tINIT delay
Powertrain: Stopped
FT = True
VIN >V
IN-INIT
SOFT START
VOUT Ramp Up
tss delay
Powertrain: Active
FT = False
RUNNING
Regulates VOUT
Powertrain: Active
FT = False
NON LATCHED
FAULT
tFAULT
Powertrain: Stopped
FT = True
NON LATCHED
FAULT
tOFF
Powertrain: Stopped
FT = True
EN = True and
No Faults
tON delay
tSS Expiry
EN = False
tOFF delay
REINITIALIZATION
SEQUENCE
tINIT delay
Powertrain: Stopped
FT = True
EN = False
Fault
Removed
Input OVLO or
Input UVLO
Fault Removed
Output OVP
Output OVP
Over-temp or
Output UVP
Over-temp or
Output UVP
Input OVLO or
Input UVLO
EN = False
tOFF-MIN delay
EN = False
tMIN-OFF delay
VIN >V
IN-UVLO+ and
not Over-temp
TR mode latched
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 8 of 23 12/2017
,:!' ::,,,: VICOR
Timing Diagrams
Module Inputs are shown in blue; Module Outputs are shown in brown.
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 9 of 23 12/2017
VICOR
VOUT-NOM
FULL LOAD
VOUT
VIN-UVLO+/-
IOUT
FULL LOAD
VOUT-UVP
VIN-OVLO+/-
VIN
TR
ILOAD
Input
Output
EN
VTR = nom
VTR-EN
VOUT-OVP
9
Input Power On
- Trim Active
11
Load dump
and reverse
current
12
Vout OVP
(primary
sensed)
14
Current Limit
with Resistive
Load
15
Resistive
Load with
decresing R
10
Vout
based on
VTR
tINIT tON tSS
tOFF
tINIT tON tSS
tINIT tON tSS
13
Latched
fault cleared
tIOUT-LIM
16
Overload induced
Output UVP
tFAULT
RLOAD
FT
VIN-INIT
Timing Diagrams (Cont.)
Module Inputs are shown in blue; Module Outputs are shown in brown.
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 10 of 23 12/2017
van (V) ouba 16 14 12 1o 2 4 a a 1D 12 14 'm (A) — Mn Tum — Low‘l’nm — Nom Tnm — High mm — Mlerim 1a VICOR
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Figure 4 No load power dissipation vs. VIN, at nominal trim
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Figure 3 Disabled power dissipation vs. VIN
Figure 5 Ideal VOUT vs. load current, at 25°C case
Typical Performance Characteristics
The following figures present typical performance at TC= 25ºC, unless otherwise noted. See associated figures for general trend data.
DCM3623x50T13A6y7z
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Figure 6 — Full Load Efficiency vs. VIN, at low trim
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Figure 7 — Full Load Efficiency vs. VIN, at nominal trim
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Figure 8 — Full Load Efficiency vs. VIN, at high trim
DCMDC-DC Converter Rev 1.0
Page 11 of 23 12/2017
Input Capacltance (uF) 50 45 40 35 30 25 20 15 10 0 8 16 24 32 40 48 55 54 72 8 Input Voltage 1V) CHI Vom: 5 V/dlv CH2Hn15A/dlv CH3 EN: 2 Vldlv Tlmebase: 100 msldlv VICOR
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Figure 12 Nominal powertrain switching frequency vs. load,
at nominal trim
Figure 13 Effective internal input capacitance vs. applied voltage
Figure 14 — Startup from EN, VIN = 30 V, COUT_EXT = 10000 µF,
RLOAD = 0.896 Ω
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Figure 11 — Efficiency and power dissipation vs.load at TCASE = 90°C,
nominal trim
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








     
Figure 10 — Efficiency and power dissipation vs.load at TCASE = 25°C,
nominal trim






















     
Figure 9 — Efficiency and power dissipation vs.load at TCASE = -40°C,
nominal trim
Typical Performance Characteristics (cont.)
The following figures present typical performance at TC= 25ºC, unless otherwise noted. See associated figures for general trend data.
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 12 of 23 12/2017
VICOR










     

  
Figure 15 Nominal powertrain switching frequency vs. load,
at nominal VIN
Typical Performance Characteristics (cont.)
The following figures present typical performance at TC= 25ºC, unless otherwise noted. See associated figures for general trend data.
Figure 16 Output voltage ripple, VIN = 30 V,
VOUT = 12.0 V, COUT_EXT = 1000 µF, RLOAD = 0.896 Ω
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 13 of 23 12/2017
VICOR
General Characteristics
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range of -40°C < TINT < 125°C for T grade and -55°C < TINT < 125°C for M grade.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Mechanical
Length L 38.34/[1.509] 38.72/[1.524] 39.1/[1.539] mm/[in]
Width W 22.67/[0.893] 22.8/[0.898] 22.93/[0.903] mm/[in]
Height H 7.11/[0.28] 7.21/[0.284] 7.31/[0.288] mm/[in]
Volume Vol No heat sink 6.41/[0.39] cm3/[in3]
Weight W 24.0/[0.85] g/[oz]
Lead finish
Nickel 0.51 2.03
µmPalladium 0.02 0.15
Gold 0.003 0.051
Thermal
Operating internal temperature TINT
T-Grade -40 125 °C
M-Grade -55 125 °C
Thermal resistance top side θINT-TOP
Estimated thermal resistance to maximum
temperature internal component from
isothermal top
1.96 °C/W
Thermal resistance leads θINT-LEADS
Estimated thermal resistance to
maximum temperature internal
component from isothermal leads
4.38 °C/W
Thermal resistance bottom side θINT-BOTTOM
Estimated thermal resistance to
maximum temperature internal
component from isothermal bottom
2.40 °C/W
Thermal capacity 17.7 Ws/°C
Assembly
Storage temperature TST
T-Grade -40 125 °C
M-Grade -65 125 °C
ESD rating
HBM Method per Human Body Model Test
ESDA/JEDEC JDS-001-2012 CLASS 1C
V
CDM Charged Device Model JESD22-C101E CLASS 2
Soldering [1]
Peak temperature top case For further information, please contact
factory applications 135 °C
[1] Product is not intended for reflow solder attach.
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 14 of 23 12/2017
VICOR
General Characteristics (Cont.)
Specifications apply over all line, trim and load conditions, internal temperature TINT = 25ºC, unless otherwise noted. Boldface specifications apply over the
temperature range of -40°C < TINT < 125°C for T grade and -55°C < TINT < 125°C for M grade.
Attribute Symbol Conditions / Notes Min Typ Max Unit
Safety
Dielectric Withstand Test VHIPOT
IN to OUT 2250 Vdc
IN to CASE 2250 Vdc
OUT to CASE 707 Vdc
Reliability
MTBF
MIL-HDBK-217 FN2 Parts Count 25°C
Ground Benign, Stationary, Indoors /
Computer
3.39 MHrs
Telcordia Issue 2, Method I Case 3, 25°C,
100% D.C., GB, GC 5.68 MHrs
Agency Approvals
Agency approvals/standards
EN 60950-1
UL 60950-1
CE Marked for Low Voltage Directive and RoHS Recast Directive, as applicable
cURus,
cTÜVus,
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 15 of 23 12/2017
_§ 7 _§_ 81 J7
Pin Functions
+IN, -IN
Input power pins. -IN is the reference for all control pins, and
therefore a Kelvin connection for the control signals is
recommended as close as possible to the pin on the package, to
reduce effects of voltage drop due to -IN currents.
+OUT, -OUT
Output power pins.
EN (Enable)
This pin enables and disables the DCM converter; when held low the
unit will be disabled. It is referenced to the -IN pin of the converter.
The EN pin has an internal pull-up to VCC through a
10 kΩresistor.
nOutput enable: When EN is allowed to pull up above the enable
threshold, the module will be enabled. If leaving EN floating, it is
pulled up to VCC and the module will be enabled.
nOutput disable: EN may be pulled down externally in order
to disable the module.
nEN is an input only, it does not pull low in the event of a fault.
TR (Trim)
The TR pin is used to select the trim mode and to trim the output
voltage of the DCM converter. The TR pin has an internal pull-up to
VCC through a 10.0 kΩresistor.
The DCM will latch trim behavior at application of VIN (once VIN
exceeds VIN-UVLO+), and persist in that same behavior until loss of
input voltage.
nAt application of VIN, if TR is sampled at above VTRIM-DIS, the
module will latch in a non-trim mode, and will ignore the TR
input for as long as VIN is present.
nAt application of VIN, if TR is sampled at below VTRIM-EN, the TR
will serve as an input to control the real time output voltage,
relative to full load, 25°C. It will persist in this behavior until VIN is
no longer present.
If trim is active when the DCM is operating, the TR pin provides
dynamic trim control at a typical 30 Hz of -3dB bandwidth over the
output voltage. TR also decreases the current limit threshold when
trimming above VOUT-NOM.
FT (Fault)
The FT pin provides a Fault signal.
Anytime the module is enabled and has not recognized a fault, the
FT pin is inactive. FT has an internal 499 kΩpull-up to Vcc, therefore
a shunt resistor, RSHUNT, of approximately 50 kΩcan be used to
ensure the LED is completly off when there is no fault, per the
diagram below.
Whenever the powertrain stops (due to a fault protection or
disabling the module by pulling EN low), the FT pin becomes active
and provides current to drive an external circuit.
When active, FT pin drives to VCC, with up to 4 mA of external
loading. Module may be damaged from an over-current FT drive,
thus a resistor in series for current limiting is recommended.
The FT pin becomes active momentarily when the module starts up.
Typical External Circuits for Signal Pins (TR, EN, FT)
10k
RTRIM
Vcc
TR
RSERIES
SW
RSHUNT
10k
Vcc
EN
Soft Start and
Fault Monitoring
Vcc
FT
Fault
Monitoring 499k
Kelvin -IN connection
Output Voltage
Reference,
Current Limit
Reference
and Soft Start Control
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 16 of 23 12/2017
wwmwico srcom/documcms/a lication nmcs/vichi a non-23 f htm‘//ap122.vicorgowcmomlfilmrDcsign/imiFilmrdo VICOR
Design Guidelines
Building Blocks and System Design
The DCM™ converter input accepts the full 9 to 50 V range, and it
generates an isolated trimmable 12.0 Vdc output.
The DCM converter provides a tightly regulated output voltage with
regulation accuracy of ± 1% for all line conditions and for any load
above 10% the rated load.
The DCM3623x50T13A6y7z is designed to be used in applications
where the output power requirements are up to 160 W.
Soft Start
When the DCM starts, it will go through a soft start. The soft start
routine ramps the output voltage by modulating the internal error
amplifier reference. This causes the output voltage to approximate a
piecewise linear ramp. The output ramp finishes when the voltage
reaches either the nominal output voltage, or the trimmed output
voltage in cases where trim mode is active.
During soft-start, the maximum load current capability is reduced.
Until Vout achieves at least VOUT-FL-THRESH, the output current must be
less than IOUT-START in order to guarantee startup. Note that this is
current available to the load, above that which is required to charge
the output capacitor.
Trim Mode and Output Trim Control
When the input voltage is initially applied to a DCM, and after tINIT
elapses, the trim pin voltage VTR is sampled. The TR pin has an
internal pull up resistor to VCC, so unless external circuitry pulls the
pin voltage lower, it will pull up to VCC. If the initially sampled trim
pin voltage is higher than VTRIM-DIS, then the DCM will disable
trimming as long as the VIN remains applied. In this case, for all
subsequent operation the output voltage will be programmed to the
nominal. This minimizes the support components required for
applications that only require the nominal rated Vout, and also
provides the best output setpoint accuracy, as there are no additional
errors from external trim components
If at initial application of VIN, the TR pin voltage is prevented from
exceeding VTRIM-EN, then the DCM will activate trim mode, and it will
remain active for as long as VIN is applied.
VOUT set point can be calculated using the equation below:
VOUT-FL = 4.99 + (9.390 • VTR/VCC) (1)
Note that the trim mode is not changed when a DCM recovers from
any fault condition or being disabled.
Module performance is guaranteed through output voltage trim
range VOUT-TRIMMING. If VOUT is trimmed above this range, then certain
combinations of line and load transient conditions may trigger the
output OVP.
Overall Output Voltage Transfer Function
Taking trim (equation 1) into account, the general equation relating
the DC VOUT to programmed trim (when active), load is given by:
VOUT = 4.99 + (9.390 • VTR/VCC) + VOUT-LL (2)
Finally, note that when the load current is below 10% of the rated
capacity, there is an additional ∆V which may add to the output
voltage, depending on the line voltage which is related to light load
boosting. Please see the section on light load boosting below for
details.
Use 0 V for ∆VOUT-LL when load is above 10% of rated load. See section
on light load boosting operation for light load effects on output voltage.
Output Current Limit
The DCM features a fully operational current limit which effectively
keeps the module operating inside the Safe Operating Area (SOA) for
all valid trim and load profiles. The current limit approximates a
“brick wall” limit, where the output current is prevented from
exceeding the current limit threshold by reducing the output voltage
via the internal error amplifier reference. The current limit threshold
at nominal trim and below is typically 120% of rated output current,
but it can vary between 100% to 150%. In order to preserve the SOA,
when the converter is trimmed above the nominal output voltage,
the current limit threshold is automatically reduced to limit the
available output power.
When the output current exceeds the current limit threshold, current
limit action is held off by 1ms, which permits the DCM to
momentarily deliver higher peak output currents to the load. Peak
output power during this time is still constrained by the internal
Power Limit of the module. The fast Power Limit and relatively slow
Current Limit work together to keep the module inside the SOA.
Delaying entry into current limit also permits the DCM to minimize
droop voltage for load steps.
Sustained operation in current limit is permitted, and no derating of
output power is required.
Some applications may benefit from well matched current
distribution, in which case fine tuning sharing via the trim pins
permits control over sharing. The DCM does not require this for
proper operation, due to the power limit and current limit behaviors
described here.
Current limit can reduce the output voltage to as little as the UVP
threshold (VOUT-UVP). Below this minimum output voltage
compliance level, further loading will cause the module to shut
down due to the output undervoltage fault protection.
Line Impedance, Input Slew rate and Input Stability Requirements
Connect a high-quality, low-noise power supply to the +IN and –IN
terminals. Additional capacitance may have to be added between +IN
and –IN to make up for impedances in the interconnect cables as
well as deficiencies in the source.
Excessive source impedance can bring about system stability issues
for a regulated DC-DC converter, and must either be avoided or
compensated by filtering components. A 1000 µF input capacitor is
the minimum recommended in case the source impedance is
insufficient to satisfy stability requirements.
Additional information can be found in the filter design application
note:
www.vicorpower.com/documents/application_notes/vichip_appnote23.pdf
Please refer to this input filter design tool to ensure input stability:
http://app2.vicorpower.com/filterDesign/intiFilter.do.
Ensure that the input voltage slew rate is less than 1V/us, otherwise a
pre-charge circuit is required for the DCM input to control the input
voltage slew rate and prevent overstress to input stage components.
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 17 of 23 12/2017
ht!p://www Vicorpnwcmom ldc-dc/isolated - regulated Idcmmncu mcmafinn VICOR
Input Fuse Selection
The DCM is not internally fused in order to provide flexibility in
configuring power systems. Input line fusing is recommended at the
system level, in order to provide thermal protection in case of
catastrophic failure. The fuse shall be selected by closely matching
system requirements with the following characteristics:
nCurrent rating (usually greater than the DCM converter’s
maximum current)
nMaximum voltage rating (usually greater than the maximum
possible input voltage)
nAmbient temperature
nBreaking capacity per application requirements
nNominal melting I2t
nRecommended fuse: See Agency Approvals for Recommended Fuse
http://www.vicorpower.com/dc-dc/isolated-
regulated/dcm#Documentation
Fault Handling
Input Undervoltage Fault Protection (UVLO)
The converter’s input voltage is monitored to detect an input under
voltage condition. If the converter is not already running, then it will
ignore enable commands until the input voltage is greater than
VIN-UVLO+. If the converter is running and the input voltage falls
below VIN-UVLO-, the converter recognizes a fault condition, the
powertrain stops switching, and the output voltage of the unit falls.
Input voltage transients which fall below UVLO for less than tUVLO
may not be detected by the fault proection logic, in which case the
converter will continue regular operation. No protection is required
in this case.
Once the UVLO fault is detected by the fault protection logic, the
converter shuts down and waits for the input voltage to rise above
VIN-UVLO+. Provided the converter is still enabled, it will then restart.
Input Overvoltage Fault Protection (OVLO)
The converter’s input voltage is monitored to detect an input over
voltage condition. When the input voltage is more than the
VIN-OVLO+, a fault is detected, the powertrain stops switching, and the
output voltage of the converter falls.
After an OVLO fault occurs, the converter will wait for the input
voltage to fall below VIN-OVLO-. Provided the converter is still enabled,
the powertrain will restart.
The powertrain controller itself also monitors the input voltage.
Transient OVLO events which have not yet been detected by the fault
sequence logic may first be detected by the controller if the input
slew rate is sufficiently large. In this case, powertrain switching will
immediately stop. If the input voltage falls back in range before the
fault sequence logic detects the out of range condition, the
powertrain will resume switching and the fault logic will not
interrupt operation Regardless of whether the powertrain is running
at the time or not, if the input voltage does not recover from OVLO
before tOVLO, the converter fault logic will detect the fault.
Output Undervoltage Fault Protection (UVP)
The converter determines that an output overload or short circuit
condition exists by measuring its primary sensed output voltage and
the output of the internal error amplifier. In general, whenever the
powertrain is switching and the primary-sensed output voltage falls
below VOUT-UVP threshold, a short circuit fault will be registered. Once
an output undervoltage condition is detected, the powertrain
immediately stops switching, and the output voltage of the converter
falls. The converter remains disabled for a time tFAULT. Once recovered
and provided the converter is still enabled, the powertrain will again
enter the soft start sequence after tINIT and tON.
Temperature Fault Protections (OTP)
The fault logic monitors the internal temperature of the converter. If
the measured temperature exceeds TINT-OTP, a temperature fault is
registered. As with the under voltage fault protection, once a
temperature fault is registered, the powertrain immediately stops
switching, the output voltage of the converter falls, and the converter
remains disabled for at least time tFAULT. Then, the converter waits for
the internal temperature to return to below TINT-OTP before
recovering. Provided the converter is still enabled, the DCM will
restart after tINIT and tON.
Output Overvoltage Fault Protection (OVP)
The converter monitors the output voltage during each switching
cycle by a corresponding voltage reflected to the primary side control
circuitry. If the primary sensed output voltage exceeds VOUT-OVP, the
OVP fault protection is triggered. The control logic disables the
powertrain, and the output voltage of the converter falls.
This type of fault is latched, and the converter will not start again
until the latch is cleared. Clearing the fault latch is achieved by either
disabling the converter via the EN pin, or else by removing the input
power such that the input voltage falls below VIN-INIT.
External Output Capacitance
The DCM converter internal compensation requires a minimum
external output capacitor. An external capacitor in the range of 1000
to 10000 µF with ESR of 10 mΩ is required, per DCM for control loop
compensation purposes.
However some DCM models require an increase to the minimum
external output capacitor value in certain loading and trim
condition. In applications where the load can go below 10% of rated
load but the output trim is held constant, the range of output
capacitor required is given by COUT-EXT-TRANS in the Electrical
Specifications table. If the load can go below 10% of rated load and
the DCM output trim is also dynamically varied, the range of output
capacitor required is given by COUT-EXT-TRANS-TRIM in the Electrical
Specifications table.
Light Load Boosting
Under light load conditions, the DCM converter may operate in light
load boosting depending on the line voltage. Light load boosting
occurs whenever the internal power consumption of the converter
combined with the external output load is less than the minimum
power transfer per switching cycle. In order to maintain regulation,
the error amplifier will switch the powertrain off and on repeatedly,
to effectively lower the average switching frequency, and permit
operation with no external load. During the time when the power
train is off, the module internal consumption is significantly
reduced, and so there is a notable reduction in no-load input power
in light load boosting. When the load is less than 10% of rated Iout,
the output voltage may rise by a maximum of 2.53 V, above the
output voltage calculated from trim, temperature, and load
line conditions.
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 18 of 23 12/2017
E 20 18 16 14 12 Maximum Power Dissipaiion (W) 10 25 an 35 40 45 50 55 so 55 7o 75 an 85 so 95 100 Temperature ('0) Top only at temperature Top and leads m Iempemmre Top, leads and new anempemiure VICOR
Thermal Design
Based on the safe thermal operating area shown in page 5, the full
rated power of the DCM3623x50T13A6y7z can be processed provided
that the top, bottom, and leads are all held below 95°C. These curves
highlight the benefits of dual sided thermal management, but also
demonstrate the flexibility of the Vicor ChiP platform for customers
who are limited to cooling only the top or the
bottom surface.
The OTP sensor is located on the top side of the internal PCB
structure. Therefore in order to ensure effective over-temperature
fault protection, the case bottom temperature must be constrained
by the thermal solution such that it does not exceed the temperature
of the case top.
The ChiP package provides a high degree of flexibility in that it
presents three pathways to remove heat from internal power
dissipating components. Heat may be removed from the top surface,
the bottom surface and the leads. The extent to which these three
surfaces are cooled is a key component for determining the
maximum power that is available from a ChiP, as can be seen from
Figure 17.
Since the ChiP has a maximum internal temperature rating, it is
necessary to estimate this internal temperature based on a real
thermal solution. Given that there are three pathways to remove heat
from the ChiP, it is helpful to simplify the thermal solution into a
roughly equivalent circuit where power dissipation is modeled as a
current source, isothermal surface temperatures are represented as
voltage sources and the thermal resistances are represented as
resistors. Figure 17 shows the "thermal circuit" for a 3623 ChiP DCM,
in an application where both case top and case bottom, and leads are
cooled. In this case, the DCM power dissipation is PDTOTAL and the
three surface temperatures are represented as TCASE_TOP, TCASE_BOTTOM,
and TLEADS. This thermal system can now be very easily analyzed
with simple resistors, voltage sources, and a current source.
This analysis provides an estimate of heat flow through the various
pathways as well as internal temperature.
Alternatively, equations can be written around this circuit and
analyzed algebraically:
TINT – PD1
θ
INT-TOP = TCASE_TOP
TINT – PD2
θ
INT-BOTTOM = TCASE_BOTTOM
TINT – PD3
θ
INT-LEADS = TLEADS
PDTOTAL = PD1+ PD2+ PD3
Where TINT represents the internal temperature and PD1, PD2, and
PD3represent the heat flow through the top side, bottom side, and
leads respectively.
Figure 18 shows a scenario where there is no bottom side cooling.
In this case, the heat flow path to the bottom is left open and the
equations now simplify to:
TINT – PD1
θ
INT-TOP = TCASE_TOP
TINT – PD3
θ
INT-LEADS = TLEADS
PDTOTAL = PD1+ PD3
Figure 19 shows a scenario where there is no bottom side and leads
cooling. In this case, the heat flow path to the bottom is left open and
the equations now simplify to:
TINT – PD1
θ
INT-TOP = TCASE_TOP
PDTOTAL = PD1
+
+
+
MAX INTERNAL TEMP
T
CASE_BOTTOM
(°C) T
LEADS
(°C) T
CASE_TOP
(°C)
Power Dissipation (W)
Thermal Resistance Top
Thermal Resistance Bottom Thermal Resistance Leads
θINT-TOP°C / W
θINT-BOTTOM°C / W θINT-LEADS°C / W
Figure 17 Double side cooling and leads thermal model
+
+
MAX INTERNAL TEMP
T
CASE_BOTTOM
(°C) T
LEADS
(°C) T
CASE_TOP
(°C)
Power Dissipation (W)
Thermal Resistance Top
Thermal Resistance Bottom Thermal Resistance Leads
Figure 18 One side cooling and leads thermal model
θINT-TOP°C / W
θINT-BOTTOM°C / W
DCM3623x50T13A6y7z
θINT-LEADS°C / W
DCMDC-DC Converter Rev 1.0
Page 19 of 23 12/2017
+
MAX INTERNAL TEMP
T
CASE_BOTTOM
(°C) T
LEADS
(°C) T
CASE_TOP
(°C)
Power Dissipation (W)
Thermal Resistance Top
Thermal Resistance Bottom Thermal Resistance Leads
Figure 19 One side cooling thermal model
θINT-TOP°C / W
θINT-BOTTOM°C / W θINT-LEADS°C / W
Figure 20 Thermal Specified Operating Area: Max Power
Dissipation vs. Case Temp for current
limited operation
www.vicorpowcr.comlpnwcrhcnch a»— Hi] 74 1 4, 3 v—{H VICOR
Vicor provides a suite of online tools, including a simulator and
thermal estimator which greatly simplify the task of determining
whether or not a DCM thermal configuration is sufficient for a given
condition. These tools can be found at:
www.vicorpower.com/powerbench.
DCMs in current limit will operate with higher output current or
power than the rated levels. Therefore the Figure 20 Thermal Safe
Operating Area plot should be used for loads that drive the DCM in
to current limit for sustained operation.
Standalone Operation
The following Figure 21 shows the configuration of the Enhanced
VOUT DCM. An input filter is required to attenuate noise coming from
the input source. In case of the excessive line inductance, a properly
sized decoupling capacitor CDECOUPLE is required as shown
in the following figure.
If signal pins (TR, EN, FT) are not used, they can be left floating, and
DCM will work in the nominal output condition.
When common mode noise in the input side is not a concern, TR and
EN can be driven and FT received using -IN as a reference.
L1: 1 µH, minimized DCR;
R1: 0.3 Ω;
C1: Ceramic capacitors in parallel, C1 = 20 µF;
L2: L2 ≥ 0.15 µH;
R2: 1 Ω;
COUT-EXT
:electrolytic or tantalum capacitor, 1000 µF C3 ≤10000 µF;
C4, C5: additional ceramic /electrolytic capacitors, if needed for
output ripple filtering;
In order to help sensitive signal circuits reject potential noise,
additional components are recommended:
R5: 301 Ω, facilitate noise attenuation for TR pin;
FB1, C2: FB1 is a ferrite bead with an impedance of at least 10 Ωat
100MHz. C2 can be a ceramic capacitor of 0.1µF. Facilitate noise
attenuation for EN pin.
Note: Use an RCR filter network as suggested in the application note
AN:030 to reduce the noise on the signal pins.
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 20 of 23 12/2017
+IN
-IN
+OUT
-OUT
R1
L1
C
1
L2
C
OUT-EXT
C4 C5
TR
EN
FT
+IN +OUT
-IN -OUT
R5
C2
FB1
DCM
F1
C
DECOUPLE
R4
R3
D1
+
V
TR
_
+
V
EN
_
R2
Figure 21 — Enhanced VOUT DCM configuration circuit
:m 72: 3A [\szums] M 5 m k (m) fl (won) I l ‘ N 1 M \ (‘1') 1 7 7 7,, 7 n 22 m ‘ [mans] l l 1 i [ 1 mr wsw (caMrousm SIDE) 5mm! 72\’un mm] mm , ‘ W m M 1m! (m1) J. W” (Pm 3? 3;? ’r 9 T 525 am [225] [m1 275 ‘ i m [”1 o o [m] ”A “:1 [11:] ““1 525 5m [m] [m] narroMI/Isw m 33 fig ymw 3g w, 25mm *; o *2 WWW ‘ ‘ ‘ \ [gym] 9 ‘ mm @ilggffil 2W ‘ mu 7 ‘ [035:]! ”w 7”? \ Q mm: [713;] ”mm ‘ W@7[f;§$fl Emma : [W317 aw \ faint, ‘1 ‘ a [ l I l , m Cowmm mm mm LAVESVREVNDN VICOR
DCM Module Product Outline Drawing Recommended PCB Footprint and Pinout
38.72±.38
1.524±.015
19.36
.762
11.40
.449
22.80±.13
.898±.005
00
0
0
TOP VIEW (COMPONENT SIDE)
1.52
.060
(2) PL.
1.02
.040
(3) PL.
1.52
.060
(4) PL.
11.43
.450
0
2.75
.108
8.25
.325
2.75
.108
8.25
.325
8.00
.315
1.38
.054 1.38
.054
4.13
.162
8.00
.315
0
18.60
.732
18.60
.732
0
0
BOTTOM VIEW
.41
.016
(9) PL.
7.21±.10
.284±.004
4.17
.164
(9) PL.
SEATING
.
PLANE
.05 [.002]
2.03
.080
PLATED THRU
.38 [.015]
ANNULAR RING
(4) PL.
2.03
.080
PLATED THRU
.25 [.010]
ANNULAR RING
(2) PL.
1.52
.060
PLATED THRU
.25 [.010]
ANNULAR RING
(3) PL.
0
8.00±.08
.315±.003
1.38±.08
.054±.003
1.38±.08
.054±.003
4.13±.08
.162±.003
8.00±.08
.315±.003
8.25±.08
.325±.003
2.75±.08
.108±.003
2.75±.08
.108±.003
8.25±.08
.325±.003
0
18.60±.08
.732±.003
18.60±.08
.732±.003
0
RECOMMENDED HOLE PATTERN
(COMPONENT SIDE)
0
+IN
TR
EN
FT
-IN
+OUT
+OUT
-OUT
-OUT
NOTES:
1- Ro
HS COMPLIANT PER CST-0001 LATEST REVISION.
DCMDC-DC Converter Rev 1.0
Page 21 of 23 12/2017
DCM3623x50T13A6y7z
Revlslan Data Descrlpflcn Page Number“) 1,0 12/1 5/1 7 mmal release we VICOR
Revision History
Revision Date Description Page Number(s)
1.0
12/15/17
Initial release n/a
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 22 of 23 12/2017
VICOR
DCM3623x50T13A6y7z
DCMDC-DC Converter Rev 1.0
Page 23 of 23 12/2017
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