Diodes Incorporated AP64501SP-EVM

Overview

AP64501SP-EVM from Diodes Incorporated is an evaluation board for the AP64501 40V, 5A synchronous buck converter IC. It implements a peak current mode controlled DC/DC step-down regulator with programmable soft-start, 570kHz fixed switching frequency, 25µA quiescent current in PFM mode, and integrated 45mΩ/20mΩ MOSFETs. The board supports 5V output at full 5A load and enables rapid validation of EMI-reduction features including Frequency Spread Spectrum (±6% jitter) and proprietary gate driver design.

For engineers reviewing the AP64501SP-EVM datasheet, AP64501SP-EVM pinout, AP64501SP-EVM application, or AP64501SP-EVM equivalent, this board provides direct access to VIN, VOUT, EN, SS, FB, COMP, and SW test points; supports configurable output voltages (1.2V–12V) via resistor dividers; and delivers measured efficiency, load transient response, and output ripple data per Diodes' Rev. 1-0 June 2019 documentation.

Technical Context

The AP64501SP-EVM implements the AP64501 IC in SO-8EP package with external passive components optimized for 5V/5A operation. It uses peak current mode control with internal compensation, enabling stable regulation across 3.8V–40V input while maintaining ±1% output accuracy via 0.8V reference voltage.

EMI mitigation is implemented through two hardware-level techniques: Frequency Spread Spectrum (FSS) modulates switching frequency by ±6% to disperse spectral energy, and a proprietary gate driver suppresses switching-node ringing without degrading turn-on/turn-off times-directly reducing high-frequency radiated noise.

Key Specifications

Availability

AP64501SP-EVM is available at Aetrix Electronics and suitable for industrial embedded developers, optical networking system designers, and cordless power tool OEMs requiring stable component supply and validated reference designs for high-efficiency DC/DC conversion.

Supply support for AP64501SP-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 industrial, consumer, and communications markets.

The AP64501 product line targets high-efficiency, low-EMI point-of-load regulation in space-constrained applications such as home audio, network systems, and white goods-emphasizing integration, thermal robustness, and simplified layout.

FAQ

What input voltage range does the AP64501SP-EVM support?

The AP64501SP-EVM supports 3.8V to 40V DC input, matching the AP64501 IC's operating range. It is validated at 12V input for 5V/5A output per the Quick Start Guide, but accepts 5V, 24V, or 36V inputs with appropriate external component selection per Table 1 in the documentation.

How is output voltage configured on the AP64501SP-EVM?

Output voltage is set using an external resistor divider on the FB pin. For 5V output, R1 = 115kΩ and R2 = 22.1kΩ are installed per Table 1. Other voltages (1.2V–12V) require corresponding R1/R2 values and may need adjustment of inductor L1 and output capacitors C5/C6/C12 per recommended selections.

Does the AP64501SP-EVM include EMI reduction features?

Yes-the board demonstrates two key EMI features of the AP64501 IC: Frequency Spread Spectrum (±6% switching frequency jitter) and a proprietary gate driver that minimizes switching-node ringing. These are implemented in hardware and measurable via oscilloscope on the SW node and output ripple tests shown in Figures 6–9.

Can the AP64501SP-EVM be used for load transient testing?

Yes-the board supports full 5A load steps (e.g., 3A to 5A) and includes test points for VOUT, SW, and EN. Figure 7 shows measured load transient response, and the Bill of Materials specifies low-ESR ceramic output capacitors (3×22µF) optimized for fast transient recovery without external compensation.