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Power Supply Design -an introduction

Power Supply Design -an introduction. Adapted from a Presentation By Doug Miller, SPU EE Alumnus. Power Supplies Overview. Linear Regulators Switching “DC-to-DC Converter” Regulators. Linear Regulators. + Simple, inexpensive + Electrically “quiet” pure DC output Vout < Vin

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Power Supply Design -an introduction

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  1. Power Supply Design-an introduction Adapted from a Presentation By Doug Miller, SPU EE Alumnus

  2. Power SuppliesOverview • Linear Regulators • Switching “DC-to-DC Converter” Regulators

  3. Linear Regulators + Simple, inexpensive + Electrically “quiet” pure DC output • Vout < Vin • Poor Efficiency e.g., if Vin = 6V, Vout = 3V, Efficiency near 50% • Can be physically large

  4. Switching Regulators • Also known as “DC-DC Converters” or “Switchmode Regulators” + Wide range of input voltages + Multiple output voltages possible + High Efficiency (often > 90% ) + Compact - Complex, more expensive - Electrically “noisy” (not pure DC)

  5. Switching RegulatorsA few types… • Buck (step-down) • Boost (step-up) • Flyback (supports multiple outputs; transformer needed) • Buck-boost (step-up or –down) • Charge Pump (no inductor)

  6. Switching RegulatorsBuck Converter – V Down only

  7. Switching RegulatorsBoost Converter – V up only

  8. Switching RegulatorsBuck-Boost – V Up or Down • What the source power fluctuates up/down past the desired output voltage? • A Buck-Boost regulator can go either way as needed • More complicated, but often worth it

  9. Design Considerations • Use linear regulators only if: • Energy conservation is not a concern • Wasted power is insignificant (less than 1 Watt) • Low noise is critical • Switching regulators are finicky • Use only the specified parts (by brand if possible) • Read and follow app note precisely • Make regulators “isolatable” with jumpers and/or fuses that can be removed

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