Diodes Incorporated AP64350SP-EVM

Overview

AP64350SP-EVM from Diodes Incorporated is an evaluation board for the AP64350 40V, 3.5A synchronous buck converter featuring programmable switching frequency (100kHz–2.2MHz), 22µA quiescent current in PFM mode, and integrated 75mΩ/45mΩ MOSFETs. It supports output voltages from 0.8V to 39V and implements Frequency Spread Spectrum (±6% jitter) and proprietary gate drive for EMI reduction. The board enables rapid validation of 5V/12V/24V distributed power bus designs.

For engineers reviewing the AP64350SP-EVM datasheet, AP64350SP-EVM pinout, AP64350SP-EVM application, or AP64350SP-EVM equivalent, this evaluation platform provides direct access to VIN, VOUT, EN, SW, and feedback nodes via test points; supports adjustable output voltage via resistor dividers; and delivers verified efficiency, load transient, and short-circuit protection performance per Diodes Inc. Rev. 1 documentation.

Technical Context

The AP64350SP-EVM implements peak current mode control with internal compensation, enabling stable regulation across 3.8V–40V input and 0.8V–39V output ranges. Its SO-8EP-mounted AP64350 IC integrates high- and low-side MOSFETs and supports external clock synchronization within 100kHz–2.2MHz.

EMI mitigation is achieved through dual mechanisms: Frequency Spread Spectrum (FSS) with ±6% switching frequency jitter and a proprietary gate driver that suppresses switching-node ringing without degrading turn-on/turn-off timing-directly reducing high-frequency radiated noise.

Key Specifications

Availability

AP64350SP-EVM is available at Aetrix Electronics and suitable for industrial embedded developers, optical networking equipment designers, and cordless power tool manufacturers requiring stable component supply, fast prototyping turnaround, and production-ready reference design validation.

Supply support for AP64350SP-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 AP64350 product line targets high-efficiency, low-EMI point-of-load conversion in space-constrained applications such as network systems and white goods, with emphasis on wide-input-voltage operation and ultralow IQ.

FAQ

What input voltage range is supported by the AP64350SP-EVM?

The AP64350SP-EVM supports input voltages from 3.8V to 40V DC, validated per Diodes Inc. Rev. 1 documentation. It operates reliably at 12V nominal input (per Quick Start Guide) and handles 45V transient spikes for up to 400ms, making it suitable for automotive and industrial 24V bus applications with surge margin.

How is output voltage adjusted on the AP64350SP-EVM?

Output voltage is set using an external resistor divider on the FB pin. Table 1 in the documentation specifies R1/R2 values for common outputs: e.g., 115kΩ/22.1kΩ yields 5.0V ±1%. The board includes solder pads and jumpers to accommodate different resistor configurations without PCB modification.

Does the AP64350SP-EVM support external clock synchronization?

Yes-the AP64350 IC on the EVM supports external clock synchronization via the RT/CLK pin, accepting frequencies from 100kHz to 2.2MHz. This allows deterministic switching alignment with system clocks to avoid beat frequencies and simplify EMI filtering in synchronized multi-rail power systems.

What protection features are demonstrated on the AP64350SP-EVM?

The EVM demonstrates undervoltage lockout (UVLO), output overvoltage protection (OVP), cycle-by-cycle peak current limiting, and thermal shutdown-each verified in the "Typical Performance Characteristics" section (Figures 6–9). Short-circuit protection recovery is observable under 3.5A load conditions per Figure 9.