Four-output, SEPIC converter-bias power supply reference design for solar panel applications
PMP21883
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Key Document

Description

This reference design supplies two non-isolated and two isolated output voltages. It references a regulated 3.3-V/0.25-A and an unregulated 12-V/0.05-A output on the primary-side, and it isolates two 12-V/0.025-A unregulated outputs.  The design operates over an input voltage range of 7 V to 45 V and offers minimal voltage ringing on the FET for lower stress and reduced EMI.

Features
  • SEPIC topology eliminates FET voltage ringing for reduced stress and lower EMI
  • Four-output single-ended primary-inductor converter (SEPIC) from single transformer provides excellent cross regulation
  • Full load efficiency greater than 80% from 12-V and 24-V input
  • Compact size (30 mm x 40 mm) minimizes required PCB area

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Schematic/Block Diagram

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Design Guide

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Design Files

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Parametrics
 PMP21883.1
(Output Voltage 1)
PMP21883.2
(Output Voltage 2)
PMP21883.3
(Output Voltage 3)
PMP21883.4
(Output Voltage 4)
Vin (Min) (V)7777
Vin (Max) (V)45454545
Vout (Nom) (V)3.3121212
Iout (Max) (A).25.05.025.025
Output Power (W).825.6.3.3
Isolated/Non-IsolatedNon-IsolatedNon-IsolatedIsolatedIsolated
Input TypeDCDCDCDC
TopologySepic- CCMSepic- CCMSepic- CCMSepic- CCM

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD19538Q2  100V, N ch NexFET MOSFETâ„¢, single SON2x2, 59mOhm  MOSFETs  Sample & Buy Not Available
LM5155-Q1  2.2MHz wide VIN non-synchronous boost/SEPIC/flyback controller  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD19538Q2 WSON (DQK)| 6 Download Download
LM5155-Q1 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 3163 08 Oct 2019
Design files (6)
Title Type Size (KB) Date
ZIP 499 08 Oct 2019
ZIP 32183 08 Oct 2019
PDF 617 08 Oct 2019
PDF 99 08 Oct 2019
PDF 97 08 Oct 2019
PDF 134 08 Oct 2019

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