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Microchip Technology SR087 Power Supply Demo Board

Microchip Technology SR087 Power Supply (PS) Demo Board is an inductorless switching power supply intended for operation directly from a 120/230VAC line. The operating principle to turn on a pass transistor is when the rectified AC input is below the output voltage. The operating principle to turn off a transistor is when the output storage capacitor is charged up to the regulation point. The SR087 PS demo board offers two outputs, 12.6V, and 5V.

Specifications

  • 90V to 270VAC input voltage range
  • 45Hz to 65Hz frequency range
  • Output voltages
    • VOUT (no load) of 12.6V ± 8% (adjustable from 9.0V to 50V)
    • VREG of 5.0V ± 5%
  • Full-load efficiency (typical)
    • 52% for VIN=120VAC
    • 44% for VIN=230VAC
  • No load standby power (typical)
    • 62mW for VIN=120VAC
    • 200mW for VIN=230VAC
  • Maximum output current
    • IREG=60mA for VIN=120VAC
    • IOUT + IREG=100mA for VIN=120VAC
    • IREG=60mA for VIN=230VAC
    • IOUT + IREG=60mA for VIN=230VAC

SR087 PS Demo Board Layout and Connection Diagram

Microchip Technology SR087 Power Supply Demo Board
Published: 2018-06-19 | Updated: 2022-11-04