The PMP9458 reference design is a conducted EMI optimized 2-layer board power supply for automotive cluster units. The power supply has two buck regulators in cascaded connection: the first stage buck generates a 5V, 2A output using the LM26003, and the second stage generates two outputs of 2.8V, 1.5A and 1.8V, 2A using the LM26420 (The max output power in total is 14W). The LM26003 is a wide Vin non-sync buck regulator, and the LM26420 is a 5V input dual 2A, high frequency sync buck regulator. They both have automotive grade versions, qualified in AEC-Q100 Grade 1. The input voltage range of the design is 6.5V to 38V making it suitable for automotive 12V battery systems. The 2-layer board design has the PCB layout optimized and adds an input filter stage to improve the conducted EMI performance. The board is tested under the automotive EMC standard, CISPR 25, and its conducted emissions are in compliance with the CISPR 25 Class 5 requirements.
| Output voltage options | PMP9458.1 |
|---|---|
| Vin (Min) (V) | 6.5 |
| Vin (Max) (V) | 38 |
| Vout (Nom) (V) | 5 |
| Iout (Max) (A) | 2 |
| Output Power (W) | 10 |
| Isolated/Non-Isolated | Non-Isolated |
| Input Type | DC |
| Topology | Buck- Non Sync^Buck- Synchronous |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Download ready-to-use system files to speed your design process.
Test results for the reference design, including efficiency graphs, test prerequisites and more
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| Technical article | Spread Spectrum: Headache tablet or vitamin pill? | PDF | HTML | May 18, 2015 | |
| Test report | PMP9458 Test Results | Aug. 20, 2014 |
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