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Load Regulation & Efficiency

Objective

  1. Evaluate buck’s Vout stability across all load conditions

  2. Measure efficiency across all load conditions

Conditions

  1. Vin = 55V, 44.4V, 36V, 25.2V, 22.2V, 18V

  2. Iout from 0A to 4A with 50 data points (0.08A step)

  3. Set power supply slew rate to minimum

  4. Temperature: room

  5. Use 4-wire sensing on power supply

  6. Don’t use the same wire that goes to eload to measure Vout

Procedure

(scripting)

  1. Solder 1 pair of wires to eload, 1 wire at Vout

  2. Connect DMM to Vout

  3. Connect Power supply to Vin

  4. Turn on power supply

Load Transient

Line Regulation

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