USB PD PSU

Aus Project Logs

Lab Bench Power Supply with USB power delivery input

Design constraints

  • Powered via USB-C PowerDelivery
  • 0V - 16V
  • 0A - 3A
  • CC-Mode
  • CV-Mode
  • show regulation mode (CC or CV)
  • show the actual current
  • show the actual voltage
  • controlled via a microcontroller

Research

  • Analog Devices circuit [1]
  • EEV Blog PSU Design [2]

System design

USB PD => BUCK Converter => Liniear Converter => current sink
=>Microcontroller => Display => Control

USB PD

STUSB4500

  • can be standalone
  • I2C interface
  • factory setting 20V?
  • Arduino Setting script [3]

USB PD Stand-alone Sink Blog

FUB302

  • requires external MCU

TPS65986

BUCK Converter

SIC437

Liniear Converter

LT3080

Datasheet[4]

  • Max 1.1A
  • 1.2V - 36V
  • Dropout Voltage 350mV
  • Min Load current 0.5mA

LT3081

Datasheet[5]

  • Max 1.5A
  • 1.2V - 36V
  • Dropout Voltage 1.5V
  • Min Load current 5mA
  • Current Monitor
  • Current Limit
  • Temp Monitor

Current Control [6]

Current sink

LTC3632

negative supply as a constant current source with transistor

Microcontroller

Arduino

STM32

Links

  1. ↑ Analog Devices High Performance Portable DC Bench Power Supply
  2. ↑ EEV Blog PSU Design Playlist
  3. ↑ Arduino Setting script
  4. ↑ LT3080 Datasheet
  5. ↑ LT3081 Datasheet
  6. ↑ LT3081 CC
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