PMP8790

Active Clamp Forward Quarter Brick (18 to 60Vdc Input 3.3V/12A) Reference Design

PMP8790

Design files

Overview

This reference design generates a 3.3V/12A output from a wide 18V-60V telecom input. The UCC2897A controls an active clamp forward converter power stage. The low gate charge and low RDSon of the CSD17501Q5A and CSD18502Q5B, implemented as self-driven synchronous rectifiers, provide for an efficient design. This design is laid out in a standard quarter brick footprint and includes enable, positive rail remote sense, and output trimming features.

Output voltage options PMP8790.1
Vin (Min) (V) 18
Vin (Max) (V) 60
Vout (Nom) (V) 3.3
Iout (Max) (A) 12
Output Power (W) 39.6
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.

SLUUAC2.PDF (2621 K)

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

SLURA34.PDF (73 K)

Detailed schematic diagram for design layout and components

SLURA35.PDF (18 K)

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

SLUC429.ZIP (301 K)

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

SLUUAC3.PDF (250 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

N-channel MOSFETs

CSD17501Q5A30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.9 mOhm

Data sheet document-pdfAcrobat PDF
N-channel MOSFETs

CSD18502Q5B40-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
Technical article Power Tips: How to Regulate a Low-Voltage, Isolated Supply Jan. 16, 2014
Test report PMP8790 Test Results Feb. 25, 2013

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