PMP31194

Automotive SEPIC reference design using integrated FET

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

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Test report — PMP31194

PDF | HTML

TIDT316.PDF (1760 K)

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

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Schematic — PMP31194

TIDMB78.PDF (201 K)

Detailed schematic diagram for design layout and components

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Bill of materials (BOM) — PMP31194

TIDMB79.PDF (236 K)

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

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Assembly drawing — PMP31194

TIDMB80.PDF (174 K)

Detailed overview of design layout for component placement

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CAD/CAE symbol — PMP31194

TIDMB82.ZIP (655 K)

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

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Gerber file — PMP31194

TIDCGC6.ZIP (108 K)

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

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PCB layout — PMP31194

TIDMB81.PDF (464 K)

PCB layer plot file used for generating PCB design layout

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

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

Download

SNVR512 — LM5157 and LM5158 Quickstart Calculator for SEPIC Regulator Design

Latest version

Version: 01.00.00.0B

Release date: 03 Apr 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

Technical documentation

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	Type	Title		Date
	Test report	Automotive SEPIC Reference Design Using an Integrated FET	PDF \| HTML	Dec. 15, 2022

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