Compact low-loss isolated four-output flybuck reference design PMP21557 (ACTIVE)

Description & Features

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Key Document

Description

This four output flybuck reference design the LM25017 synchronous buck converter to provide four 3.3 V, 82.5 mW outputs. Each output has 1.25 kV isolation and is regulated to 1% accuracy. A low profile transformer and low BOM count create a compact solution size.

Features
  • Four 1.25 kV isolation, which mitigates noise between outputs
  • 1% accuracy on each 3.3 V output, to meet high precision specifications
  • Compact design with low profile transformer, which allows for easy integration into end system
  • Less than 750 mW losses with all outputs at full load, which provides efficent power conversion

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Schematic/Block Diagram

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Design Guide

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Design Files

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Parametrics
 PMP21557.1
(Output Voltage 1)
PMP21557.2
(Output Voltage 2)
PMP21557.3
(Output Voltage 3)
PMP21557.4
(Output Voltage 4)
Vin (Min) (V)19191919
Vin (Max) (V)29292929
Vout (Nom) (V)3.33.33.33.3
Iout (Max) (A).025.025.025.025
Output Power (W).0825.0825.0825.0825
Isolated/Non-IsolatedIsolatedIsolatedIsolatedIsolated
Input TypeDCDCDCDC
TopologyFlybuck
Linear Regulator
Flybuck
Linear Regulator
Flybuck
Linear Regulator
Flybuck
Linear Regulator

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM25017  7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck Regulator  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
TLV755P  500-mA low-IQ small-size low-dropout (LDO) regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM25017 Download Download
Download Download
TLV755P Download -
Download -
Download -

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1793 17 Dec 2018
Design files (6)
Title Type Size (KB) Date
ZIP 204 17 Dec 2018
ZIP 452 17 Dec 2018
PDF 323 17 Dec 2018
PDF 82 17 Dec 2018
PDF 91 17 Dec 2018
PDF 108 17 Dec 2018

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