18Vdc-60Vdc Input, 3.3V/15A Active Clamp Forward, 1/8 Brick Reference Design


Design files


The PMP8973 reference design generates a 3.3V/15A output from an 18V to 60V telecom input. The UCC2897A controls an active clamp forward converter power stage. The low gate charge and low RDSon of the CSD16415Q5 and CSD18502Q5B, implemented as synchronous rectifiers, provides for a highly efficient design. This design is laid out in a standard eighth brick footprint and achieves peak efficiencies over 92%.  It includes remote sensing of the output voltage.

  • Peak efficiency > 92%
  • Remote sensing of output voltage
  • Wide 18V-60Vdc input range
  • Compatible with standard 1/8 (eight) brick footprint
  • Test report available
Output voltage options PMP8973.1
Vin (Min) (V) 18
Vin (Max) (V) 60
Vout (Nom) (V) 3.3
Iout (Max) (A) 15
Output Power (W) 49.5
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.

TIDUAB7.PDF (3596 K)

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

TIDRG41.PDF (144 K)

Detailed schematic diagram for design layout and components

TIDRG42.PDF (82 K)

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

TIDRG43.PDF (150 K)

Detailed overview of design layout for component placement


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


Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD16415Q525-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 1.8 mOhm

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18502Q5B40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.3 mOhm

Data sheet: PDF | HTML
N-channel MOSFETs

CSD19533Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.5 mOhm

Data sheet: PDF | HTML
General-purpose op amps

TLV272Dual, 16-V, 3-MHz operational amplifier

Data sheet: PDF | HTML
PWM controllers

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

Data sheet: PDF | HTML
Shunt voltage references

LM4041D121.2-V precision micropower shunt voltage reference with 1% accuracy

Data sheet: PDF

Technical documentation

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Type Title Date
* Test report PMP8973 Test Results Jul. 16, 2015

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