USB PD PSU

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
• EEV Blog PSU Design

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

USB PD Stand-alone Sink Blog

FUB302

• requires external MCU

Liniear Converter

LT3080

Datasheet

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

LT3081

Datasheet

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

Current Control

Current sink

LTC3632

negative supply as a constant current source with transistor