This reference design is a 12-V pre regulator reference design for multiple automotive applications powering up to 36-W. The used SEPIC topology allows to step up and step down the input voltage, so cranking down to 5-V is supported; the controller LM5122 itself allows cranking down to 3-V at reduced power level. Due to continuous currents at the input of any SEPIC topology the reflected ripple is low, means conducted emissions are reduced just by using smart topology. For even lower EMI the design is able to operate in forced PWM mode, for best light load efficiency a true diode emulation could be selected via jumper. Synchronous rectification results in full load efficiency 93% + and fine thermal behavior - by using a generic dual inductor from stock.
| Output voltage options | PMP30491.1 |
|---|---|
| Vin (Min) (V) | 6 |
| Vin (Max) (V) | 18 |
| Vout (Nom) (V) | 12 |
| Iout (Max) (A) | 2.5 |
| Output Power (W) | 30 |
| Isolated/Non-Isolated | Non-Isolated |
| Input Type | DC |
| Topology | Sepic- Synchronous |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Test results for the reference design, including efficiency graphs, test prerequisites and more
Detailed schematic diagram for design layout and components
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | Tiny SEPIC Reference Design With 12-V/ 2.5-A Output | Dec. 07, 2018 |
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