Diodes Incorporated AP64501QSP-EVM

Overview

AP64501QSP-EVM from Diodes Incorporated is an evaluation board for the AP64501Q 40V, 5A synchronous buck converter featuring programmable soft-start, 25µA quiescent current in PFM mode, 570kHz switching frequency, and integrated 45mΩ/20mΩ MOSFETs in SO-8EP package. It enables rapid validation of 5V/5A point-of-load designs in automotive and industrial power systems.

For engineers reviewing the AP64501QSP-EVM datasheet, AP64501QSP-EVM pinout, AP64501QSP-EVM application, or AP64501QSP-EVM equivalent, this board supports quick-start functional verification, efficiency measurement at full load, EMI performance assessment with FSS enabled, and output voltage configuration via resistor dividers per Table 1.

Technical Context

The AP64501QSP-EVM implements peak current mode control with Frequency Spread Spectrum (±6% jitter) to suppress narrowband EMI emissions. Its layout includes optimized power loop routing, dedicated test points for VIN, VOUT, SW, EN, SS, and COMP, and a 4.7µH shielded inductor rated for 10.9A DC current.

Board-level features include jumper-controlled enable (JH6), soft-start time adjustment via external capacitor on SS pin, precision feedback network (R1/R2 = 52.3kΩ/10kΩ for 5V), and three parallel 22µF ceramic output capacitors (CGA6P1X8L1C226M250AC) to minimize high-frequency ripple under 5A load transients.

Key Specifications

Availability

AP64501QSP-EVM is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC I/O modules, and optical networking point-of-load conversion requiring stable component supply and fast design validation cycles.

Supply support for AP64501QSP-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 automotive, industrial, and consumer markets.

The AP64501Q product line delivers high-efficiency, low-EMI DC/DC conversion for harsh-environment applications where input voltage range, quiescent current, and automotive qualification are critical.

FAQ

What input voltage should be used for initial power-up?

Apply 12V DC to VIN and GND terminals as specified in the Quick Start Guide. This ensures safe operation within the AP64501Q's recommended operating conditions while avoiding overstress during evaluation. The board is configured for 5V output, and 12V input provides adequate headroom for regulation and transient response testing.

How is output voltage set on this evaluation board?

Output voltage is set by the R1/R2 feedback divider: R1 = 52.3kΩ and R2 = 10kΩ yield 5.0V ±1%, per the internal 0.8V reference. These values match Table 1 in the documentation and are soldered in place; no rework is needed for default 5V operation.

Does the board support Frequency Spread Spectrum (FSS) out of the box?

Yes, FSS is enabled by default in the AP64501Q IC and requires no external configuration. The evaluation board's layout preserves the internal FSS functionality, and radiated EMI measurements in Figure 6–9 confirm its effectiveness without additional filtering components.

Can the soft-start time be adjusted, and how?

Yes, soft-start time is programmed by connecting an external capacitor between the SS pin and GND. The board includes a dedicated test point (TP_SS) and pad for capacitor placement; typical values range from 1nF (≈1ms) to 100nF (≈100ms), scaling linearly with capacitance per the AP64501Q datasheet.