380VDC Input, 24V/170W Active Clamp Forward Reference Design


Design files


This reference design uses the UCC2894 to control an active clamp forward converter that generates an isolated 24 V at 7 A from a 380-VDC input. This supply is intended to be used with a PFC boost front end and requires an external 12-V bias voltage for housekeeping on the primary side. This supply is up to 91% efficient at full load.

  • 91% efficiency
  • Clamped drain voltage for reduced emissions
  • Compact form factor 64 mm x 90 mm (2.5 in x 3.5 in)
Output voltage options PMP7391.1
Vin (Min) (V) 320
Vin (Max) (V) 380
Vout (Nom) (V) 24
Iout (Max) (A) 7
Output Power (W) 168
Isolated/Non-Isolated Isolated
Input Type DC
Topology Forward- Active Clamp
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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.

SLUU909A.PDF (1606 K)

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

SLUR863A.PDF (166 K)

Detailed schematic diagram for design layout and components

SLUR862A.PDF (62 K)

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


Detailed overview of design layout for component placement

TIDRKK5.PDF (2430 K)

Detailed overview of design layout for component placement


Includes TI products in the design and potential alternatives.

PWM controllers

UCC289416V active clamp current mode PWM controller with N-channel clamp FET and line OV protection

Data sheet: PDF
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP7391 Test Results (Rev. A) Feb. 23, 2016

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