ELECTRONICS
SEPIC DC-DC Converter
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CASE ANALYSIS
Scenario
A designer needs a SEPIC converter schematic to step up/down a 4.5–12V input to a regulated 12V 1A output using the LM3478 controller.
Key decisions
- Use SEPIC topology for input voltages that can be above, equal to, or below the output
- Select 100µH inductors and 10µF coupling cap to handle 1A load at 500kHz switching
When to reuse this
Battery-powered applications where the input voltage varies widely and must be boosted or bucked to a fixed output.
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circuit-sepic-converter-using-lm3478-for-4-5v-to-12v-at-1a