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PMP31194

Automotive SEPIC reference design using integrated FET

Design files

PMP31194

Design files

Overview

This reference design is a small SEPIC auxiliary power supply using the LM5157-Q1 device with integrated FET. A highlight of this design is the small board space achieved by efficiency, so switching frequency has been set to 440 kHz. Output voltage can be set from 5 V to 7 V, depending on load requirements. The design has been tested up to 2-A peak current. The continuous current is approximately 1 A, resulting in a temperature rise +30 K at the SMA rectifier or hottest spot. The maximum output current depends on the minimum input voltage due to peak current limitation. Optional ORing diodes at the BIAS pin to supply the controller with output voltage allow cold cranking as low as 2 V after startup VIN > 3 V. The undervoltage lockout UVLO allows a flexible setup. An optional LC input filter attenuates reflected ripple. The inductor was selected for high self-resonance frequency to act beyond the FM band.

Features
  • 6-V bias supply for automotive applications and general purpose, step up and step down
  • Sensitive to cost with a single driver, FET and rectifier
  • High integration due to powerful internal FET
  • Provides input filter to prevent from FM band noise
  • Supports ultralow cold cranking as low as 1.5-V input voltage by ORing diodes
  • Completely built and tested in a lab
Output voltage options PMP31194.1
Vin (Min) (V) 8
Vin (Max) (V) 18
Vout (Nom) (V) 6
Iout (Max) (A) 1
Output Power (W) 6
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Sepic- CCM^Sepic- Integrated Switch
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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.

download Test report — PMP31194
PDF | HTML
TIDT316.PDF (1761 KB)

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

download Assembly drawing — PMP31194
TIDMB80.PDF (174 KB)

Detailed overview of design layout for component placement

download Bill of materials (BOM) — PMP31194
TIDMB79.PDF (236 KB)

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

download CAD/CAE symbol — PMP31194
TIDMB82.ZIP (656 KB)

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

download Gerber file — PMP31194
TIDCGC6.ZIP (108 KB)

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

download PCB layout — PMP31194
TIDMB81.PDF (464 KB)

PCB layer plot file used for generating PCB design layout

download Schematic — PMP31194
TIDMB78.PDF (202 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

LM5157-Q1 — 6-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum

Data sheet: PDF | HTML

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Software

Calculation tool

SNVR512 — LM5157 and LM5158 Quickstart Calculator for SEPIC Regulator Design

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM5157 — 6A/4A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5157-Q1 — 6-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51571-Q1 — 4-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158-Q1 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581-Q1 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum
Hardware development
Reference design
PMP31194 — Automotive SEPIC reference design using integrated FET
Download options

SNVR512 — LM5157 and LM5158 Quickstart Calculator for SEPIC Regulator Design

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Version: 01.00.00.0B
Release date: Apr 3, 2022
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LM5157 and LM5158 Quickstart Calculator for SEPIC Regulator Design (zip)  — 1383 K

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Products
AC/DC & DC/DC converters (integrated FET)
LM5157 — 6A/4A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5157-Q1 — 6-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51571-Q1 — 4-A, 50-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM5158-Q1 — 3-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum LM51581-Q1 — 1.5-A, 85-V, 2.2-MHz wide VIN boost, flyback, & SEPIC converter with dual random spread spectrum
Hardware development
Reference design
PMP31194 — Automotive SEPIC reference design using integrated FET

Release Information

The design resource accessed as www.ti.com/lit/zip/snvr512 or www.ti.com/lit/xx/snvr512b/snvr512b.zip has been migrated to a new user experience at www.ti.com/tool/download/SNVR512. Please update any bookmarks accordingly.

Technical documentation

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* Test report Automotive SEPIC Reference Design Using an Integrated FET PDF | HTML Dec 15, 2022

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