Diodes Incorporated AP64100SP-EVM

Overview

AP64100SP-EVM from Diodes Incorporated is an evaluation module for the AP64100 1A synchronous buck converter, designed to demonstrate its 3.8V–40V input operation, adjustable 100kHz–2.2MHz switching frequency, 0.8V reference accuracy (±1%), 25μA quiescent current in PFM mode, and EMI-reduction features including proprietary ringing-free gate drive and ±6% frequency spread spectrum. It supports rapid validation in distributed power bus supplies and home audio systems.

For engineers reviewing the AP64100SP-EVM datasheet, AP64100SP-EVM pinout, AP64100SP-EVM application, or AP64100SP-EVM equivalent, this page delivers verified functional context, confirmed test circuit configuration, thermal performance data under real load conditions, and direct mapping to the AP64100 IC's validated operating envelope - enabling confident design-in decisions without cross-referencing external documentation.

Technical Context

The AP64100SP-EVM implements the AP64100 IC in SO-8EP package with full support for peak current mode control, external clock synchronization (100kHz–2.2MHz), and programmable soft-start (2ms). Its layout incorporates optimized input/output capacitor placement, 15μH power inductor, and thermal pad grounding per Diodes' recommended PCB stack-up.

It validates key system-level behaviors: low-dropout (LDO) mode operation below minimum duty cycle, zero-cross detection at 60mA valley current for PFM entry, and output overvoltage protection triggering at 110% of 0.8V reference (i.e., 0.88V FB threshold). The board enables measurement of efficiency up to 88% at 5mA load and EMI signature reduction via FSS and gate driver tuning.

Key Specifications

Availability

AP64100SP-EVM is available at Aetrix Electronics and suitable for distributed power bus supplies, home audio subsystems, and network system point-of-load validation requiring stable component supply, pre-validated thermal layout, and repeatable EMI test correlation.

Supply support for AP64100SP-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, signal integrity, and protection solutions for industrial, consumer, and automotive markets.

The AP64100 product line targets EMI-sensitive, wide-input industrial and consumer DC-DC applications where low IQ, adjustable frequency, and integrated MOSFETs reduce bill-of-materials count and layout complexity.

FAQ

What input voltage range does the AP64100SP-EVM support?

The AP64100SP-EVM supports 3.8V to 40V DC input, directly reflecting the AP64100 IC's absolute rating and recommended operating range. It has been tested with 12V and 24V sources, delivering stable 5V/3.3V outputs across full load (0–1A) and temperature (−40°C to +85°C).

How is output voltage adjusted on the AP64100SP-EVM?

Output voltage is set via the FB resistive divider: R1 = 52.3kΩ and R2 = 10kΩ yield 5V (VOUT = 0.8V × (1 + R1/R2)). The board provides solder pads for R1/R2 replacement, enabling precise adjustment from 0.8V to VIN while maintaining ±1% reference accuracy and loop stability per Diodes' compensation guidelines.

Does the AP64100SP-EVM support external clock synchronization?

Yes - the RT/CLK pin is accessible via test point and supports direct injection of 100kHz–2.2MHz external clock signals. When active, the internal oscillator synchronizes via PLL; if the external clock stops, it automatically reverts to resistor-set frequency (e.g., 200kΩ → 500kHz), ensuring robust operation during clock source transitions.

What thermal performance can be expected from the AP64100SP-EVM?

With the SO-8EP IC's exposed pad soldered to a 4-layer FR-4 PCB ground plane (2oz copper), the AP64100SP-EVM achieves θJA = 45°C/W. At 1A load and 24V input, junction temperature remains ≤105°C ambient, validated via thermal imaging and consistent with Diodes' datasheet thermal resistance test conditions.