AP33771C

EVB User Guide

AP33771C EVB User Guide

Rev. 1.0

2 of 12

www.diodes.com

July 2024

© 2024 Copyright Diodes Incorporated. All Rights Reserved.

Chapter 1.

Introduction

The growing popularity of standard USB PD3.1 chargers for mobile phones and notebook PCs spurs the demand for leveraging standard

PD3.1 chargers to replace purposely and individually built chargers for battery-power electronic devices, reducing E-Waste.

The AP33771C Evaluation Board (EVB) is intended to be used as an evaluation vehicle for charging applications between a Type-C

Connector-equipped Device (TCD, Energy Sink) and a Type-C Connector-equipped PD Charger or Adaptor (PDC, Energy Source) through

a Type-C to Type-C cable.

Figure 1 illustrates a TCD embedded with a PD3.1 sink controller IC (i.e. AP33771C). This is physically connected to a PDC, embedded

with a USB PD3.1 source controller (e.g. AP43771) through a suitable Type-C to Type-C cable. Based on the USB PD3.1 compliance

protocol, the AP33771C may go through the USB PD3.1 standard negotiation process with the AP43771, and then the TCD will retrieve

power from the PDC.

Figure 1

– A typical TCD with the AP33771C PD3.1 Sink Controller requesting power from a USB PDC

To improve the AP33771C

’s user experience as a USB sink controller in TCDs, the AP33771C has built-in firmware to deal with automatic

cable voltage drop compensation, as well as legacy Type-A charging through a Type-A to Type-C cable.

The AP33771C

’s Evaluation Board (EVB) User Guide explains a simple resistor-setting arrangement to request desired input voltage and

current for a typical TCD. The grant voltage and current back from a PDC, for a successful match with source capability, can cover the

power request.

USB PDC