DIODES AP64501 DC Buck Converter Owner’s Manual

DIODES AP64501 DC Buck Converter

Product Information

Specifications

• Product Name: AP64501SP-EVM
• Input Voltage Range: 3.8V to 40V
• Output Current: 5A
• Operating Frequency: 570kHz
• Efficiency: Up to 85% at 5mA Light Load
• Package: SO-8EP

Features

• Programmable Soft-Start Time
• Peak Current Mode Control
• EMI Reduction with Proprietary Gate Driver Design
• Protection Circuitry: UVLO, OVP, Peak Current Limit, Thermal Shutdown
• Fully RoHS Compliant and Environmentally Friendly Design

Applications

The AP64501SP-EVM is suitable for various applications including:

• Distributed Power Bus Supplies (5V, 12V, 24V)
• Power Tools and Laser Printers
• White Goods and Small Home Appliances
• Home Audio Systems
• Network Systems
• Consumer Electronics
• General Purpose Point of Load

Product Usage Instructions

Quick Start Guide

1. Connect a power supply to the input terminals VIN and GND. Set VIN to 12V.
2. Connect the positive terminal of the electronic load to VOUT and the negative terminal to GND.
3. Enable IC by placing a jumper at JH6 to ON position to connect EN pin to VIN through a 100K resistor or leave it disconnected.
4. Measure the output voltage using a multimeter between VOUT and GND.
5. Set the load to 5A through the electronic load.
6. Check for the stable operation of the SW signal on the oscilloscope.

Frequently Asked Questions (FAQ)

• Q: What is the recommended operating voltage range for the AP64501SP-EVM?
  A: The recommended operating voltage range is from 3.8V to 40V.

• Q: Does the device have protection circuitry?
  A: Yes, the device features protection circuitry including UVLO, OVP, Peak Current Limit, and Thermal Shutdown.

DESCRIPTION

• The AP64501 is a 5A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 45mΩ highside power MOSFET and a 20mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.

• The AP64501 device is easily used by minimizing the external component count due to its adoption of peak current mode control.

• The AP64501 design is optimized for Electromagnetic Interference (EMI) reduction. The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, which
  reduces high-frequency radiated EMI noise caused by MOSFET switching. AP64501 also features Frequency Spread Spectrum (FSS) with a switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time.

• The device is available in an SO-8EP package

FEATURES

• VIN 3.8V to 40V
• 5A Continuous Output Current
• 0.8V ± 1% Reference Voltage
• 25μA Low Quiescent Current (Pulse Frequency Modulation)
• 570kHz Switching Frequency
• Programmable Soft-Start Time
• Up to 85% Efficiency at 5mA Light Load
• Proprietary Gate Driver Design for Best EMI Reduction
• Frequency Spread Spectrum (FSS) to Reduce EMI
• Low-Dropout (LDO) Mode
• Precision Enable Threshold to Adjust UVLO
• Protection Circuitry
  • Undervoltage Lockout (UVLO)
  • Output Overvoltage Protection (OVP)
  • Cycle-by-Cycle Peak Current Limit
  • Thermal Shutdown
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device

APPLICATIONS

• 5V, 12V, and 24V Distributed Power Bus Supplies
• Power Tools and Laser Printers
• White Goods and Small Home Appliances
• Home Audio
• Network Systems
• Consumer Electronics
• General Purpose Point of Load

TYPICAL APPLICATIONS CIRCUIT

ABSOLUTE MAXIMUM RATINGS

VIN

| ****

Supply Pin Voltage

| -0.3 to +42.0 (DC)| ****

V

-0.3 to +45.0 (400ms)
VBST| Bootstrap Pin Voltage| VSW – 0.3 to VSW + 6.0| V
VEN| Enable/UVLO Pin Voltage| -0.3 to +42.0| V
VSS| Soft-Start Pin Voltage| -0.3 to +6.0| V
VFB| Feedback Voltage| -0.3V to +6.0| V
VCOMP| Compensation Pin Voltage| -0.3 to +6.0| V

VSW

| ****

Switch Node Voltage

| -0.3 to VIN + 0.3 (DC)| ****

V

-2.5 to VIN + 2.0 (20ns)
TJ| Junction Temperature| +160| °C
TL| Lead Temperature| +260| °C

RECOMMENDED OPERATING CONDITIONS

EVALUATION BOARD

QUICK START GUIDE

The AP64501SP-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP64501SP, follow the procedure below:

1. Connect a power supply to the input terminals VIN and GND. Set VIN to 12V.
2. Connect the positive terminal of the electronic load to VOUT and negative terminal to GND.
3. For Enable, to enable IC, place a jumper at JH6 to “ON” position to connect EN pin to VIN through 100KΩ resistor or leave it OPEN. Jump to “OFF” position to disable IC.
4. The evaluation board should now power up with a 5.0V output voltage.
5. Check for the proper output voltage of 5.0V (±1%) at the output terminals VOUT and GND. Measurement can also be done with a multimeter with the positive and negative leads between VOUT and GND.
6. Set the load to 5A through the electronic load. Check for the stable operation of the SW signal on the oscilloscope. Measure the switching frequency.

MEASUREMENT/PERFORMANCE GUIDELINES

1. When measuring the output voltage ripple, maintain the shortest possible ground lengths on the oscilloscope probe. Long ground leads can erroneously inject high frequency noise into the measured ripple.
2. For efficiency measurements, connect an ammeter in series with the input supply to measure the input current. Connect an electronic load to the output for output current.

SETTING OUTPUT VOLTAGE:
Table 1 shows a list of recommended component selections for common output voltages

VOUT| R1| R2| L1| R7| C7| C1, C2| C5, C6, C13
---|---|---|---|---|---|---|---
1.2V| 4.99KΩ| 10KΩ| 1.2V| 3.74KΩ| 2.7nF| 2×10µF| 3×22µF
1.5V| 8.66KΩ| 10KΩ| 1.5V| 4.75KΩ| 2.7nF| 2×10µF| 3×22µF
1.8V| 12.4KΩ| 10KΩ| 1.8V| 5.62KΩ| 2.7nF| 2×10µF| 3×22µF
2.5V| 21.5KΩ| 10KΩ| 2.5V| 7.87KΩ| 2.7nF| 2×10µF| 3×22µF
3.3V| 31.6KΩ| 10KΩ| 3.3V| 10.5KΩ| 2.7nF| 2×10µF| 3×22µF
5.0V| 52.3KΩ| 10KΩ| 5.0V| 15.8KΩ| 2.7nF| 2×10µF| 3×22µF
12V| 140KΩ| 10KΩ| 12V| 37.4KΩ| 2.7nF| 2×10µF| 3×22µF

EVALUATION BOARD SCHEMATIC

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

BILL OF MATERIALS for AP64501SP-EVM for VOUT=5V

Ref| Value| Description| Qty| Size| Vendor Name| Manufacturer PN| PCB Layer
---|---|---|---|---|---|---|---
C1, C2| 10µF| Ceramic Capacitor, 50V, X7R, 10%| 2| 1206| Samsung| CL31B106KBHNNNE| Top
C3, C4, C9| 0.1µF| Ceramic Capacitor, 50V, X7R, 10%| 3| 0603| Wurth Electronics| 885012206095| Top
C5, C6, C13| 22µF| Ceramic Capacitor, 16V, X7R| 3| 1210| Samsung| CL32B226KOJNNNE| Top
C7| 2.7nF| Ceramic Capacitor, 50V, X7R| 1| 0603| Murata| GRM1885C1H272JA01D| Top
C8| 10nF| Ceramic Capacitor, 25V, X7R| 1| 0603| Wurth Electronics| 885012206065| Top
R1| 52.3KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF5232V| Top
R2| 10KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF1002V| Top
R3, R8| 0Ω| RES SMD 1% 1/10W| 2| 0603| Vishay| CRCW06030000Z0EAC| Top
R4| 100KΩ| RES SMD 1% 1/10W| 1| 0603| Vishay| CRCW0603100KFKEA| Top
R7| 15.8KΩ| RES SMD 1% 1/10W| 1| 0603| Bourns Inc| CR0603-FX-1582ELF| Top

L1

| ****

3.6µH

| DCR=12.2mΩ, Ir=8.2A| ****

1

| 10.2x

10.2x

4.5mm

| Wurth Electronics| ****

7447797360

| ****

Top

JH6| | PCB Header, 40 POS| 1| 1X3| 3M| 2340-6111TG| Top
VIN, VOUT,

GNDx2

| ****

1598

| Terminal Turret Triple 0.094″ L (Test

Points)

| ****

4

| Through- Hole| Keystone Electronics| ****

1598-2

| ****

Top

U1

| ****

AP64501

| Sync DC-DC Converter| ****

1

| ****

SO-8EP

| Diodes

Incorporated (Diodes)

| ****

AP64501SP

| ****

Top

TYPICAL PERFORMANCE CHARACTERISTICS

IMPORTANT NOTICE

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February 2024
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