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User Guide for Diodes Incorporated 18W QC3.0 SSR Premium Charger EV1 Board

Quick start guide and technical documentation for the Diodes Incorporated 18W QC3.0 SSR Premium Charger EV1 evaluation board, including connection procedures, specifications, and testing results.

Table of contents

Manual images

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Bottom view of the PCB showing component layout and soldering points. Page 2 Top view of the assembled PCB with main components visible. Page 2 Table of electrical performance parameters and test results. Page 3 Efficiency and input power test data table. Page 3 Evaluation Board Schematic Page 4 Bottom side of the PCB highlighting the layout of conductive paths. Page 8

Quick guide from the manual

This document serves as a technical user guide for the 18W QC3.0 SSR Premium Charger EV1 evaluation board. It provides essential information for engineers and developers to set up, connect, and test the charger board. The board is designed for high-efficiency, cost-effective QC3.0 charging applications.

System Overview

The EV1 board is composed of three primary components: the AP3302 PWM controller, the APR34509 synchronous rectification switcher, and the AP43331N QC3.0 decoder. It supports a wide input voltage range (90Vac to 264Vac) and provides constant voltage (CV) and constant current (CC) modes.

Evaluation Board Schematic
Evaluation Board Schematic

System Setup and Connections

Before connecting the board, ensure the AC source is switched off. The setup requires a Diodes 18W QC3.0 & 2.0 Test Kit, a USB 3.0 to Micro B cable, and an electronic load (or a QC3.0-equipped smartphone). Connect the AC input L and N wires to the power supply output. Use banana jack cables to connect the E-load to the board's output terminals.

Bottom view of the PCB showing component layout and soldering points.
Bottom view of the PCB showing component layout and soldering points.
Top view of the assembled PCB with main components visible.
Top view of the assembled PCB with main components visible.
Table of electrical performance parameters and test results.
Table of electrical performance parameters and test results.
Efficiency and input power test data table.
Efficiency and input power test data table.
Bottom side of the PCB highlighting the layout of conductive paths.
Bottom side of the PCB highlighting the layout of conductive paths.
Top side of the PCB showing surface-mount component pads.
Top side of the PCB showing surface-mount component pads.
Identification of AC input and USB output connection points.
Identification of AC input and USB output connection points.
Setup for testing the charger with a mobile device.
Setup for testing the charger with a mobile device.
Test Kit Input & Output and E-load Connections
Test Kit Input & Output and E-load Connections
Oscilloscope waveform showing startup characteristics.
Oscilloscope waveform showing startup characteristics.
Oscilloscope waveform showing shutdown characteristics.
Oscilloscope waveform showing shutdown characteristics.

Testing Procedures

The charger defaults to 5V upon startup. Use the buttons on the test kit to cycle between QC2.0 and QC3.0 modes. In QC3.0 mode, the output voltage can be adjusted in 200mV increments between 3.6V and 12V using the '+' and '-' buttons.

Technical Specifications

  • Input Voltage: 90Vac to 264Vac
  • Output Power: <= 18W
  • Efficiency: 87.5%
  • Standby Power: < 75mW
  • Dimensions: 37 x 39 x 20 mm
  • Protections: OVP, UVP, OLP, BNO, FOCP, SSCP, OTP

Safety and Compliance

The board meets DOE6 and CoC Tier 2 efficiency requirements and is RoHS compliant. It is designed for evaluation purposes and should be handled with appropriate safety precautions for high-voltage AC circuits.

Manufacturer information

Diodes Incorporated

Brand profile
Manufacturer website https://www.diodes.com Support https://www.diodes.com/support

Practical help

Common problems

Charger not outputting expected voltage

Ensure the test kit is in the correct mode (QC2.0 or QC3.0) and verify the connection to the E-load.

High standby power

Verify that no load is connected and that the input voltage is within the specified 90-264Vac range.

Before use

  • Ensure AC power source is switched OFF before making connections.
  • Prepare a Diodes 18W QC3.0 & 2.0 Test Kit.
  • Prepare a one-foot USB 3.0 to Micro B cable.
  • Verify that the E-load is ready for connection to the output terminals.
  • Check that all wiring (AC L & N) is secure.

Specs in practice

Input Voltage
The board operates between 90Vac and 264Vac.
Output Power
Maximum total constant output power is 18W.
Standby Power
No-load power consumption is less than 75mW.

Images and diagrams

  • Figure 3: Full schematic of the EV1 board showing input filtering, PWM controller, and feedback loop.
  • Figure 10: Visual guide for connecting the test kit and E-load to the board.
  • Figure 11: Identification of the voltage adjustment buttons on the test kit.

Model compatibility

  • Supports Qualcomm QC 3.0 and QC 2.0 protocols.
  • Designed for use with USB Type A output connectors.
  • Not authorized for use as a critical component in life support systems.

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