PMP9656

48V-60VDC Input, 12V/250W Active Clamp Forward Reference Design

PMP9656

Design files

Overview

This reference design generates a 12V/21A output from 54V DC input. The UCC2897A controls an active clamp forward converter power stage. The low gate charge and low RDSon of the CSD18532Q5B, implemented as self-driven synchronous rectifiers, allow this design to achieve a max load efficiency of nearly 96%.  The compact UCC27511 drivers simplify the gate drive circuitry for the synchronous rectifiers.

Features
  • Over 95% efficiency at max load
  • 89% efficiency at 10% load
  • Low output ripple
  • Self-driven synchronous rectifiers (using CSD18532Q5B MOSFETs) reduce drive complexity
  • Generates regulated 12V bus for telecom or server applications
  • Low profile, less than 14mm max component height
Output voltage options PMP9656.1
Vin (Min) (V) 48
Vin (Max) (V) 60
Vout (Nom) (V) 12
Iout (Max) (A) 21
Output Power (W) 252
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.

Important note
This reference design replaces the now obsolete PMP7376 52-V to 60-Vdc input, 12-V/22-A active clamp forward reference design.

Design files & products

Design files

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

TIDU605.PDF (2608 K)

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

TIDRBD0A.PDF (162 K)

Detailed schematic diagram for design layout and components

TIDRBD1.PDF (84 K)

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

TIDRBD2A.PDF (103 K)

Detailed overview of design layout for component placement

TIDRWD5.ZIP (807 K)

Files used for 3D models or 2D drawings of IC components

TIDCEP0.ZIP (797 K)

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

TIDRBD3A.PDF (724 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Low-side drivers

UCC275114-A/8-A single-channel gate driver with 5-V UVLO, split outputs, and 13-ns Prop delay

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD18532Q5B60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 3.2 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

Technical documentation

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Type Title Date
* Test report PMP9656 Test Results Oct. 16, 2014
Technical article Power Tips: How to Maximize Efficiency in PoE and Telecom Supplies Dec. 27, 2014

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