Diodes Incorporated AP63203WU-EVM

Overview

AP63203WU-EVM from Diodes Incorporated is an evaluation board for the AP63203WU 32V, 2A synchronous buck converter featuring integrated 125mΩ high-side and 68mΩ low-side MOSFETs, 1.1MHz fixed-frequency operation with Frequency Spread Spectrum (±6% jitter), 0.8V ±1% reference voltage, and ultralow 22µA quiescent current in PFM mode-designed for EMI-sensitive consumer power supplies delivering 3.3V output.

For engineers reviewing the AP63203WU-EVM datasheet, AP63203WU-EVM pinout, AP63203WU-EVM application, or AP63203WU-EVM equivalent, this board enables rapid validation of efficiency (up to 95% at 12V_IN/3.3V_OUT/1A), output ripple performance (<20mV_AC at 2A), thermal behavior, and EMI reduction efficacy under real load conditions using standard lab equipment.

Technical Context

The AP63203WU-EVM implements peak current mode control with an integrated compensation network, eliminating external loop compensation components. Its TSOT26-mounted AP63203WU IC operates across 3.8–32V input and delivers regulated 3.3V output via fixed internal feedback.

EMI mitigation combines proprietary gate driver design (suppressing switching node ringing without extending t_ON/t_OFF) and Frequency Spread Spectrum (FSS) modulation, reducing peak radiated emissions by distributing energy across a ±6% frequency band centered at 1.1MHz.

Key Specifications

Availability

AP63203WU-EVM is available at Aetrix Electronics and suitable for FPGA/DSP power sequencing, flat-panel display bias supplies, and network system auxiliary rails requiring stable component supply, fast evaluation turnaround, and validated EMI-compliant layout practices.

Supply support for AP63203WU-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The AP63203 belongs to Diodes' high-efficiency DC/DC converter product line, engineered specifically for noise-sensitive consumer and computing applications where compact size, low EMI, and light-load efficiency are primary design constraints.

FAQ

What input voltage range is supported on the AP63203WU-EVM?

The board accepts 3.8V to 32V DC input, matching the AP63203WU IC's operational range. It is validated at 12V input per the Quick Start Guide, but supports full-range testing including 24V industrial bus evaluation. Absolute maximum input is 35V DC, with transient rating up to 40V for 400ms.

How is output voltage set on this evaluation board?

The AP63203WU-EVM is configured for fixed 3.3V output by connecting the FB pin directly to VOUT, leveraging the IC's internal 0.8V reference and precision feedback path. No external resistor divider is used or required-this configuration eliminates trimming errors and simplifies validation of regulation accuracy and load transient response.

Does the board include EMI-reduction features beyond the IC's FSS?

Yes-the board layout implements optimized power loop area minimization, dedicated ground plane partitioning, and strategic placement of the 6.8µH shielded inductor (Würth 744 393 460 68) and low-ESR ceramic capacitors (C1–C3, C6–C8). These physical design choices complement the IC's FSS and proprietary gate driver to achieve measurable reductions in both conducted and radiated emissions.

Can the AP63203WU-EVM be used to evaluate thermal performance?

Yes-the TSOT26 package of the AP63203WU is mounted on a 2-layer PCB with thermal vias and copper pour connected to GND, enabling direct junction-to-ambient thermal resistance measurement. The board sustains 2A continuous output at +85°C ambient per test data, and thermal shutdown activation at ~150°C junction temperature is observable via SW signal cessation and EN pin behavior.