18- to 36-VDC input, 25-W DC/DC active clamp forward reference design
PMP22509
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Key Document

Description

This active clamp forward design converts an 18-V to 36-V input to a 5-V, 25-W output. The reference design uses the UCC2897A advanced current-mode active-clamp PWM controller to simplify active clamp implementation with a P-channel auxiliary FET. The design achieves 91.7% peak efficiency at 24-V input. The active clamp topology allows for self-driving synchronous rectifier (SR) FETs, lowering cost and complexity on the secondary side. This design also uses a catalog transformer and inductor.

Features
  • Achieves 90% efficiency from 30% to 100% load at 24-V input
  • Self-driven SR (using CSD17579Q3A MOSFETs) reduces drive complexity
  • Uses catalog magnetics for a cost-effective solution

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Schematic/Block Diagram

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Design Guide

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Design Files

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Parametrics
 PMP22509.1
(Output Voltage 1)
Vin (Min) (V)18
Vin (Max) (V)36
Vout (Nom) (V)5
Iout (Max) (A)5
Output Power (W)25
Isolated/Non-IsolatedIsolated
Input TypeDC
TopologyForward- Active Clamp

TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17579Q3A  30-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 14.2 mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
CSD19537Q3  100-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 14.5 mOhm  MOSFETs  Sample & Buy Not Available
TL431LI  Adjustable precision shunt regulator with optimized reference current (pin layout: KRA)  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
UCC2897A  110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD17579Q3A VSONP (DNH)| 8 Download Download
CSD19537Q3 VSON-CLIP (DQG)| 8 Download Download
TL431LI Download Download
UCC2897A Download Download
Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2178 18 Jun 2020
Design files (6)
Title Type Size (KB) Date
ZIP 599 18 Jun 2020
ZIP 1021 18 Jun 2020
PDF 681 18 Jun 2020
PDF 159 18 Jun 2020
PDF 94 18 Jun 2020
PDF 175 18 Jun 2020

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