Diodes Incorporated AP64100QSP-EVM

Overview

AP64100QSP-EVM from Diodes Incorporated is an automotive-grade evaluation module for the AP64100Q 40V, 1A synchronous buck converter. It implements peak current mode control with adjustable 100kHz–2.2MHz switching frequency, integrated 150mΩ/80mΩ MOSFETs, and EMI-optimized gate drive + Frequency Spread Spectrum (±6% jitter). Designed for AEC-Q100 Grade 1 (−40°C to +125°C) operation, it supports 5V/3.3V DC-DC conversion in automotive infotainment and instrument cluster power rails.

For engineers reviewing the AP64100QSP-EVM datasheet, AP64100Q pinout, AP64100Q application, or AP64100Q equivalent, this EVM enables rapid validation of input voltage range (3.8V–40V), light-load PFM efficiency (88% @ 5mA), soft-start timing (2ms), thermal shutdown (+160°C), and UVLO threshold adjustment via EN pin.

Technical Context

The AP64100QSP-EVM implements a fixed-frequency peak current mode controller with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its proprietary multi-level gate driver suppresses SW node ringing without degrading rise/fall times, directly reducing high-frequency radiated EMI.

Frequency Spread Spectrum (FSS) modulates switching frequency by ±6% around the set point (e.g., 500kHz ±30kHz), spreading conducted/radiated noise energy across a wider band. The module supports external clock synchronization (100kHz–2.2MHz) and resistor-based timing (RT = 200kΩ yields 500kHz typical).

Key Specifications

Availability

AP64100QSP-EVM is available at Aetrix Electronics and suitable for automotive infotainment systems, instrument clusters, and telematics modules requiring stable component supply, production-ready reference designs, and AEC-Q100-compliant validation support.

Supply support for AP64100QSP-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-reliability power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.

The AP64100Q product line delivers AEC-Q100 Grade 1 synchronous buck converters optimized for EMI-sensitive automotive subsystems where input transients, thermal constraints, and long-term reliability are critical design factors.

FAQ

What is the purpose of the AP64100QSP-EVM?

The AP64100QSP-EVM is a fully assembled evaluation board for the AP64100Q synchronous buck converter. It provides a validated layout, tested BOM (including 15μH inductor, 2×10μF input caps, 22μF output cap), and accessible test points to verify startup behavior, efficiency curves, transient response, and EMI performance under real automotive input conditions (3.8V–40V).

Does the EVM support external clock synchronization?

Yes - the RT/CLK pin on the AP64100QSP-EVM is routed to a header (J2) allowing direct injection of an external 100kHz–2.2MHz clock signal. When active, the internal oscillator synchronizes via PLL; if the external clock stops, the device automatically reverts to resistor-set frequency using the onboard 200kΩ timing resistor.

How is UVLO threshold adjusted on this EVM?

The EVM includes optional resistor pads (R3/R4) on the EN pin to configure custom UVLO thresholds. With the internal 4μA pull-up and 1.18V EN threshold, users can set rising/falling VIN thresholds (e.g., 6.5V/5.8V) using equations provided in the datasheet - enabling precise power-rail sequencing in multi-supply automotive systems.

What thermal performance can be expected from the EVM?

With the SO-8EP package's exposed thermal pad soldered to a 4-layer PCB ground plane (2oz copper), the AP64100QSP-EVM achieves θJA = 45°C/W. At 1A/5V output and 12V input, junction temperature remains below +110°C in still air - well within the +150°C max operating limit and enabling reliable Grade 1 operation.