Diodes Incorporated AP64351SP-EVM

Overview

AP64351SP-EVM from Diodes Incorporated is an evaluation board for the AP64351 40V, 3.5A synchronous buck converter featuring 22µA quiescent current, 570kHz switching frequency, programmable soft-start, and integrated FSS for EMI reduction. It supports output voltages from 0.8V to 39V and is configured for 5.0V/3.5A operation using SO-8EP-packaged U1 (AP64351SP) in a compact, test-point-accessible layout.

For engineers reviewing the AP64351SP-EVM datasheet, AP64351SP-EVM pinout, AP64351SP-EVM application, or AP64351SP-EVM equivalent, this board enables rapid validation of efficiency, load transient response, output ripple, short-circuit protection, and soft-start timing under real-world input conditions (3.8–40V), making it essential for power supply design in industrial, consumer, and networking systems.

Technical Context

The AP64351SP-EVM implements peak current mode control with a fixed 570kHz switching frequency and Frequency Spread Spectrum (±6% jitter) to suppress narrowband EMI emissions. Its layout minimizes parasitic inductance via optimized power loops and includes dedicated test points for VIN, VOUT, SW, EN, SS, and FB signals.

It integrates the AP64351 IC with fully specified protection: cycle-by-cycle current limiting, thermal shutdown, output overvoltage protection, and precision enable threshold for adjustable UVLO. The board supports configurable output voltage via external resistor dividers and soft-start time via capacitor on the SS pin.

Key Specifications

Availability

AP64351SP-EVM is available at Aetrix Electronics and suitable for industrial embedded developers, optical communication systems, and cordless power tools requiring stable component supply, fast prototyping turnaround, and validated reference designs for high-efficiency DC/DC conversion.

Supply support for AP64351SP-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, automotive, and consumer markets.

The AP64351 product line delivers high-voltage synchronous buck converters optimized for EMI-sensitive applications, combining low IQ, wide VIN range, and integrated gate drive enhancements for reliable point-of-load regulation.

FAQ

What input voltage range is supported by the AP64351SP-EVM?

The AP64351SP-EVM supports input voltages from 3.8V to 40V DC, as defined by the AP64351 IC's absolute maximum rating and recommended operating conditions. It has been validated at 12V input for 5V/3.5A output, and can operate across common industrial bus rails including 5V, 12V, and 24V without modification.

How do I configure the AP64351SP-EVM for a different output voltage?

Output voltage is set by the R1/R2 feedback divider per the AP64351's 0.8V reference. Table 1 in the user guide lists resistor values for standard outputs (1.2V–12V); replace R1 and R2 with the specified values and verify stability with load transients and ripple measurements. No PCB changes are required beyond component replacement.

Does the AP64351SP-EVM include EMI mitigation features?

Yes - the board implements the AP64351's built-in Frequency Spread Spectrum (±6% jitter) and proprietary gate driver design that suppresses switching node ringing. Layout optimizations-including minimized SW loop area, ground plane integrity, and strategic decoupling-further reduce radiated and conducted EMI per CISPR 22/32 guidelines.

Can the AP64351SP-EVM be used for long-term reliability testing?

No - the AP64351SP-EVM is a single-layer evaluation platform intended for functional verification and performance characterization, not burn-in or accelerated life testing. For production use, Diodes recommends designing a custom PCB with thermal vias, enhanced copper pour, and conformal coating per application environmental requirements.