Software
Calculation tool
PMP31194
Automotive SEPIC reference design using integrated FET
PMP31194
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 |
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.
TIDT316.PDF (1760 K)
Test results for the reference design, including efficiency graphs, test prerequisites and more
TIDMB78.PDF (201 K)
Detailed schematic diagram for design layout and components
TIDMB79.PDF (236 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDMB80.PDF (174 K)
Detailed overview of design layout for component placement
TIDMB82.ZIP (655 K)
Files used for 3D models or 2D drawings of IC components
TIDCGC6.ZIP (108 K)
Design file that contains information on physical board layer of design PCB
TIDMB81.PDF (464 K)
PCB layer plot file used for generating PCB design layout
Start development
Technical documentation
No results found. Please clear your search and try again.
View all 1
| Type | Title | Date | ||
|---|---|---|---|---|
| Test report | Automotive SEPIC Reference Design Using an Integrated FET | PDF | HTML | Dec. 15, 2022 |
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.