DC1902B: Ideal Bridge Controller, 12 ~ 24VAC, 9 ~ 60VDC


Demonstration circuit 1902B features the ideal diode bridge controller LT®4320 suitable for applications that require low to medium current AC to DC full-wave rectification or DC polarity correction and a small compact solution.

The LT4320 drives four N-channel MOSFETs to perform full-wave rectification functionally similar to a diode bridge but with much lower power dissipation. This topology eases thermal design, and increases usable output voltage. In addition, an all N-channel topology has benefits over a P-channel topology such as a wider selection of MOSFETs, lower cost, lower RDS(ON), and smaller footprint.

Only a few essential components are required to operate the LT4320 as an ideal diode bridge: four N-channel MOSFETs, a bypass ceramic capacitor, and an AC smoothing capacitor (CLOAD). The DC1902B includes low RDS(ON) N-channel MOSFETs (21mΩ typical) to support low to medium current applications. When an AC voltage source is used, the onboard CLOAD (C2) capacitor allows for up to 1.5A of average output current. Add additional CLOAD capacitance to support higher current AC applications. A unidirectional TVS (D1) is included to protect the application from brief overvoltage events up to the part rating. A footprint for bidirectional TVS (D2) is also included and is recommended for electrically harsh conditions.


Manufacturer Analog Devices Inc.
Category Power Management
Sub-Category Ideal Bridge Controller
Eval Board Part Number DC1902B-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Current Out 700 mA
1.5 A
3.5 A
Voltage In 9 ~ 60 VDC
12 ~ 24 VAC
Features Over Voltage Protection
Under Voltage Protection, Brown-Out
Quiescent Current [Typical] - Not Given
Component Count + Extras 7 + 12
Application / Target Market PoE, Power Over Ethernet
Power: Auxiliary Power Supply
Security IP Camera
Design Author Linear Technology
Quiescent Current [Maximum] - Not Given
Main I.C. Base Part LT4320
Date Created By Author 2013-06
Date Added To Library 2014-04

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