Diodes Incorporated AP64352SP-EVM

Overview

AP64352SP-EVM from Diodes Incorporated is an evaluation board for the AP64352 40V, 3.5A synchronous buck converter with internal compensation, ultralow 22µA quiescent current in PFM mode, programmable 100kHz–2.2MHz switching frequency, and integrated EMI-reduction features including Frequency Spread Spectrum (±6% jitter) and proprietary gate driver design. It supports 5V output at 3.5A and is used to validate power delivery in industrial and consumer DC/DC point-of-load designs.

For engineers reviewing the AP64352SP-EVM datasheet, AP64352SP-EVM pinout, AP64352SP-EVM application, or AP64352SP-EVM equivalent, this board enables rapid characterization of efficiency, load transient response, output ripple, short-circuit protection, and soft-start behavior under real-world input (3.8–40V) and thermal (-40°C to +85°C ambient) conditions.

Technical Context

The AP64352SP-EVM implements a peak-current-mode controlled synchronous buck topology using the AP64352 IC in SO-8EP package, featuring fully integrated 75mΩ high-side and 45mΩ low-side MOSFETs. Its internal loop compensation eliminates external Type-II/III networks, reducing BOM count while maintaining stability across 0.8V–39V output range.

EMI mitigation is achieved via dual mechanisms: ±6% frequency spread spectrum modulation and a proprietary gate driver that suppresses switch-node ringing without degrading turn-on/turn-off timing-directly addressing radiated noise in compact, high-density layouts typical of network systems and cordless power tools.

Key Specifications

Availability

AP64352SP-EVM is available at Aetrix Electronics and suitable for industrial embedded developers, network systems designers, cordless power tool OEMs, and consumer electronics production programs requiring stable component supply and fast-turn evaluation of high-efficiency, wide-input buck converters.

Supply support for AP64352SP-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, computing, and consumer markets.

The AP64352 product line delivers high-voltage synchronous buck converters optimized for EMI-sensitive applications where minimal external components, low IQ, and robust protection (OVP, UVLO, thermal shutdown) are mandatory.

FAQ

What input voltage range is supported during evaluation?

The AP64352SP-EVM operates with input voltages from 3.8V to 40V DC, verified per absolute maximum ratings. Recommended test points include 12V (default startup), 24V, and 36V to assess efficiency and thermal performance across the full operating range.

How is output voltage set on this evaluation board?

Output voltage is set by resistor divider R1/R2 on the feedback node (FB). For 5.0V output, R1 = 115kΩ and R2 = 22.1kΩ are populated; Table 1 in the user guide lists values for 1.2V–12V outputs, all using the same 0.8V reference.

Does the board support external clock synchronization?

Yes - the RT/CLK pin (JH15 test point) accepts an external clock signal from 100kHz to 2.2MHz, enabling synchronization to system clocks or noise-sensitive timing domains to avoid beat frequencies in multi-rail systems.

What protections are implemented and how are they verified?

The board demonstrates cycle-by-cycle overcurrent, output overvoltage (OVP), undervoltage lockout (UVLO), and thermal shutdown. Verification is performed via oscilloscope capture of SW node during overload/short events and thermal imaging during sustained 3.5A operation at +85°C ambient.