Diodes Incorporated AP62400WU-EVM

Overview

AP62400WU-EVM from Diodes Incorporated is an evaluation board for the AP62400 synchronous buck converter - a 4A, 18V-input COT-controlled DC/DC regulator in TSOT26 package. It delivers 5V output at up to 4A with 800kHz switching, 190μA quiescent current, and integrated 50mΩ/22mΩ MOSFETs. Designed for rapid validation of power supply designs in consumer and embedded systems.

For engineers reviewing the AP62400WU-EVM datasheet, AP62400WU-EVM pinout, AP62400WU-EVM application, or AP62400WU-EVM equivalent, this board enables fast functional verification of input range (4.2–18V), output regulation (0.8–7V), EMI-optimized switching, thermal shutdown, and UVLO behavior under real load conditions.

Technical Context

The AP62400WU-EVM implements the AP62400 IC in a fixed 5V configuration using R1=52.3kΩ and R2=10kΩ feedback network, 2.2µH power inductor, and dual 22µF output capacitors. It supports direct enable control via JH8 jumper and provides test points for VIN, VOUT, SW, EN, and BST signals.

Board-level design incorporates Diodes' proprietary gate driver scheme to suppress switching node ringing while preserving fast MOSFET turn-on/turn-off times - directly enabling low-radiated EMI measurement per CISPR-22/32 guidelines without added filtering components.

Key Specifications

Availability

AP62400WU-EVM is available at Aetrix Electronics and suitable for FPGA power sequencing, consumer audio supply validation, and 12V-to-5V point-of-load testing requiring stable component supply and repeatable lab characterization.

Supply support for AP62400WU-EVM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for high-volume industrial and consumer applications.

The AP62400 product line targets cost-sensitive, space-constrained DC/DC conversion in flat-panel displays, home appliances, and network equipment - emphasizing low IQ, fast transient response, and EMI compliance without external compensation.

FAQ

What input voltage range is supported on the AP62400WU-EVM?

The board accepts 4.2V to 18V DC input via screw terminals. It is pre-configured for 12V input operation per the Quick Start Guide, but functions across the full AP62400 IC range. Absolute maximum input is 20V DC (22V for 400ms transients), verified per Diodes' Absolute Maximum Ratings table.

How do I change the output voltage from 5V to another value?

Replace R1 (52.3kΩ) and retain R2 (10kΩ) to set new VOUT using VOUT = 0.8V × (1 + R1/R2). For example, 3.3V requires R1 = 31.6kΩ. The board includes solder pads for alternative resistor placement and supports output voltages from 0.8V to 7V per the AP62400 datasheet's feedback network guidelines.

Does the AP62400WU-EVM include thermal protection verification capability?

Yes - the AP62400 IC integrates thermal shutdown (TJ = +150°C trip), and the board's layout exposes the U1 TSOT26 package for direct IR thermography or thermocouple attachment. Performance curves in the datasheet confirm thermal foldback behavior under sustained 4A load at +85°C ambient.

Can the AP62400WU-EVM be used for conducted EMI measurements?

Yes - the board includes dedicated test points for VIN, VOUT, and SW, and its optimized layout minimizes loop area. When paired with a LISN and spectrum analyzer, it enables repeatable CISPR-22 Class B conducted emissions testing per the AP62400's EMI-reduction architecture, including bootstrap capacitor (C6) tuning guidance for >2.5V outputs.