36Vdc-75Vdc Input, 20V @ 4A Output, Active Clamp Forward
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The PMP3799 reference design provides an adjustible 20V output at 4A from a standard 48V telecom input with greater than 93% efficiency. This design uses the UCC2897A active clamp controller along with an ISO721 digital isolator and TPS28225 to drive synchronous rectifiers. The output voltage can be adjusted from 16V to 24V by changing a single resistor value. The circuit is built in an industry standard quarter-brick footprint.

See the Important Notice and Disclaimer covering reference designs and other TI resources.


(Output Voltage 1)
Vin (Min) (V)36
Vin (Max) (V)75
Vout (Nom) (V)20
Iout (Max) (A)4
Output Power (W)80
Input TypeDC
TopologyForward- Active Clamp

TI Devices (3)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ISO721M  Single-channel, 150-Mbps digital isolator  Isolation  Sample & Buy Not Available
TPS28225  4-A, 27-V half bridge gate driver with 4-V UVLO for synchronous rectification  Gate drivers  Sample & Buy Not Available
UCC2897A  110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ISO721M Download Download
Download -
TPS28225 Download Download
Download Download
UCC2897A Download Download
Download Download

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Step 2: Download the Symbol and Footprint from the CAD.bxl file table.

Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 952 14 Apr 2013
Design files (4)
Title Type Size (KB) Date
PDF 80 14 Apr 2013
ZIP 160 14 Apr 2013
PDF 19 14 Apr 2013
PDF 62 14 Apr 2013

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