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TPS23757EVM: 5V @ 2.2A, 30 ~ 57 Vin

Summary

The TPS23757 is a combined Power over Ethernet (PoE) powered device (PD) interface and current-mode dc/dc controller optimized specifically for isolated converters. The PoE interface supports the IEEE 802.3at standard for a type 1 PD, which is equivalent to the 13W standard of IEEE 802.3-2008.

The TPS23757 supports a number of input voltage ORing options including highest voltage, external adapter preference, and PoE preference.

The TPS23757 has an output flag indicating if an external wall adapter is active when used in conjunction with ORing controls. The detection signature pin can also be used to force power from the PoE source off. Classification can be programmed to any of the defined types with a single resistor.

The dc/dc controller features two complementary gate drivers with programmable dead time. This simplifies design of highly efficient flyback topologies or active-clamp forward or flyback converters. The second gate driver may be disabled if desired for single MOSFET topologies. The controller also features internal softstart, bootstrap startup source, current-mode compensation, and a 78% maximum duty cycle. A programmable and synchronizable oscillator allows design optimization for efficiency and eases use of the controller to upgrade existing power supply designs. Accurate programmable blanking, with a default period, simplifies the usual current-sense filter design trade-offs.

The TPS23757 has a 9 V converter startup, permitting operation with 12 V wall adapters.

Specifications

Manufacturer Texas Instruments
Category Power Management
Sub-Category POE - Power Over Ethernet
Eval Board Part Number 296-25232-ND
Eval Board Supplier Texas Instruments
Eval Board Normally In Stock
Compliance IEEE 802.3af (802.3at Type 1)
Outputs and Type 1 Isolated
Voltage Out 3.3 V
5 V
Current Out 2.2 A
3.3 A
Voltage In 30 ~ 57 V
Efficiency @ Conditions >87%, 44V in, 5V @ 2.2 A
>86%, 44V in, 3.3V @ 3.3 A
Internal Switch Yes
Features Current Limit (Adj. or Fixed)
Soft Start
Thermal Protection
Switching Frequency 220 kHz
Component Count + Extras 91 + 39
Design Author Texas Instruments
Application / Target Market PoE, Power Over Ethernet
RF: WLAN Access Points
Security IP Camera
VOIP Phones
Main I.C. Base Part TPS23757PW
Date Created By Author
Date Added To Library 2011-03

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