Diodes Incorporated AP64200SP-EVM

Overview

AP64200SP-EVM from Diodes Incorporated is an evaluation module for the AP64200 2A synchronous buck converter, designed to demonstrate its operation across 3.8V–40V input, adjustable 100kHz–2.2MHz switching frequency, and 0.8V–VIN output regulation in SO-8EP package. It validates EMI-reduction features including proprietary ringing-free gate drive and ±6% frequency spread spectrum (FSS), targeting point-of-load conversion in network systems and consumer electronics.

For engineers reviewing the AP64200SP-EVM datasheet, AP64200SP-EVM pinout, AP64200SP-EVM application, or AP64200SP-EVM equivalent, this board enables rapid validation of light-load PFM efficiency (88% at 5mA), low-I_Q (25μA), thermal shutdown (+160°C), and precision enable threshold (1.18V) under real-world layout and load conditions.

Technical Context

The AP64200SP-EVM implements peak current mode control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its reference design uses a 10μH inductor, dual 10μF/22μF output capacitors, and 52.3kΩ/10kΩ FB divider to set 5V output, matching the AP64200's 0.8V ±1% feedback reference and 2ms soft-start timing.

EMI mitigation is validated via two integrated mechanisms: a multi-level gate driver that suppresses SW node ringing without degrading rise/fall times, and FSS modulation synchronized to the internal oscillator or external clock (100kHz–2.2MHz), reducing spectral energy density at discrete frequencies.

Key Specifications

Availability

AP64200SP-EVM is available at Aetrix Electronics and suitable for power tool battery management, home audio DC-DC conversion, white goods motor control supplies, and industrial network system PoL regulation requiring stable component supply and fast design validation.

Supply support for AP64200SP-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 high-efficiency power management solutions for automotive, industrial, and consumer markets.

The AP64200 product line delivers EMI-optimized synchronous buck converters for demanding point-of-load applications where low quiescent current, wide VIN range, and robust protection are critical - not general-purpose DC-DC conversion.

FAQ

What input voltage range does the AP64200SP-EVM support?

The AP64200SP-EVM supports 3.8V to 40V DC input, matching the AP64200 IC's operational range. It has been validated with 12V and 24V sources per the typical application circuit in DS43573 Rev. 1–2, using appropriate input bulk capacitance (2 × 10μF) and layout practices to maintain stability and EMI performance.

How is output voltage adjusted on the AP64200SP-EVM?

Output voltage is set via the FB resistive divider: R1 = 52.3kΩ and R2 = 10kΩ yield 5V (V_OUT = 0.8V × (1 + R1/R2)). The board provides test points and optional resistor pads to modify R1/R2 for other outputs between 0.8V and VIN, maintaining compatibility with the AP64200's 0.8V ±1% reference and 100mV load regulation.

Does the AP64200SP-EVM demonstrate EMI reduction features?

Yes - it validates both proprietary ringing-free gate drive (measured SW node overshoot <10% of VIN) and ±6% frequency spread spectrum (FSS). Oscilloscope captures in the datasheet show reduced 500kHz harmonic peaks and lower radiated emissions in conducted EMI tests when FSS is enabled versus fixed-frequency operation.

Can the AP64200SP-EVM be used for thermal performance evaluation?

Yes - the SO-8EP footprint includes a thermally enhanced exposed pad electrically tied to GND and connected to a 4-layer PCB ground plane. Thermal resistance θ_JA = 45°C/W is verified per JEDEC JESD51-7, enabling junction temperature estimation (T_J = T_A + P_LOSS × 45°C/W) during 2A continuous load testing at +85°C ambient.