36Vdc-72Vdc Input, 1.2V/25A Active Clamp Forward


Design files


This reference design generates a 1.2V/25A output from a standard 48V telecom input. The UCC2897A controls an active clamp forward converter power stage. The low gate thresholds of the CSD16401Q5 and CSD16325Q5 allow these devices to be used as self-driven synchronous rectifiers for a highly efficient design. This design also includes enable, remote sense, and output overvoltage features.

Output voltage options PMP6912.1
Vin (Min) (V) 36
Vin (Max) (V) 72
Vout (Nom) (V) 1.2
Iout (Max) (A) 25
Output Power (W) 30
Isolated/Non-Isolated Isolated
Input Type DC
Topology Forward- Active Clamp^Forward- Synchronous

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

SLUU932.PDF (4215 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

SLUR882.PDF (104 K)

Detailed schematic diagram for design layout and components

SLUR883.PDF (29 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

SLUC350.ZIP (370 K)

Design file that contains information on physical board layer of design PCB

SLUU933.PDF (350 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD16325Q525-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.2 mOhm

Data sheet document-pdfAcrobat PDF
N-channel MOSFETs

CSD16401Q525-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.3 mOhm

Data sheet document-pdfAcrobat PDF open-in-new HTML
PWM controllers

UCC2897A110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

TLV431A1% accuracy, low-voltage, adjustable precision shunt regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
Test report PMP6912 Test Results Apr. 12, 2012

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