220V-400VDC Input, 5V/100W Active Clamp Forward Reference Design


Design files


This reference design generates an isolated 5V/100W output from a high voltage DC input. This design is intended to operate from the output of a PFC front end regulator. The UCC2897A is used to control an active clamp forward converter. Self-driven synchronous rectifiers allow for 91% efficiency. An accurate current limit is provided by directly sensing the output current. A clock pulse output is also provided for synchronizing with other converters.

  • 220V-400VDC to 5V/20A Output (100W)
  • 91% efficiency
  • Ouput Current Sensing
  • Features UCC2897A Controller along with TI NexFET Synchronous Rectifiers
  • Active Clamp Forward Topology
  • Reduced conduction losses and die area of the synchronous rectifiers
Output voltage options PMP7413.1
Vin (Min) (V) 220
Vin (Max) (V) 400
Vout (Nom) (V) 5
Iout (Max) (A) 20
Output Power (W) 100
Isolated/Non-Isolated Isolated
Input Type DC
Topology Forward- Active Clamp^Forward- Synchronous
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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.

SLUU988.PDF (2572 K)

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

SLUR925.PDF (174 K)

Detailed schematic diagram for design layout and components

SLUR926.PDF (83 K)

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

SLUC375.ZIP (218 K)

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

SLUU989.PDF (361 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
Test report PMP7413 Test Results Jun. 27, 2012

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