DIODES AP64502SP-EVM Low IQ Synchronous DC-DC Buck Converter Owner’s Manual

AP64502SP-EVM
40V, 5A, Low IQ, Synchronous DC-DC Buck Converter
with Internal Compensation

DESCRIPTION

The AP64502 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 stepdown DC-DC conversion.
The AP64502 device is easily used by minimizing the external component count due to its adoption of peak current mode control along with its integrated loop compensation network.
The AP64502 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. The AP64502 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
• Output Voltage (VOUT): 0.8V to VIN
• 5A Continuous Output Current
• 0.8V ± 1% Reference Voltage
• 25µA Low Quiescent Current (Pulse Frequency Modulation)
• Adjustable Switching Frequency: 100kHz to 2.2MHz
• External Clock Synchronization: 100kHz to 2.2MHz
• Adjustable 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

APPLICATIONS

• 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
  • 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
• For automotive applications requiring specific change control (i.e. parts qualified to AECQ100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative.
  https://www.diodes.com/quality/product-definitions/

TYPICAL APPLICATION CIRCUIT

ABSOLUTE MAXIMUM RATINGS

-0.3 to +45.0 (400ms)
VEST| Bootstrap Pin Voltage| Vsw – 0.3 to Vsw + 6.0| V
VEN| Enable/UVLO Pin Voltage| -0.3 to +42.0| V
VRT/CLK| RT/CLK Pin Voltage| -0.3 to +6.0| V
VFB| Feedback Voltage| -0.3V to +6.0| V
Vss| Soft-Start 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)
| Junction Temperature| +160| °C
T1.| Lead Temperature| +260| °C

RECOMMENDED OPERATING CONDITIONS

EVALUATION BOARD

QUICK START GUIDE

The AP64502SP-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP64502SP, 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.

Table 1. Common Output Voltages

EVALUATION BOARD SCHEMATIC

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

BILL OF MATERIALS for AP64502SP-EVM for V OUT =5V

Ref| Value| Description| Qty| Size| Vendor Name| Manufacturer PN
---|---|---|---|---|---|---
Cl, C2| 10pF| Ceramic Capacitor, 50V, X7R, 10%| 2| 1206| Samsung| CL31B106KBHNNNE
C3, C4, C9| 0.1pF| Ceramic Capacitor, 50V, X7R, 10%| 3| 603| Wurth Electronics| 885012206095
C5, C6, C13, C14| 47pF| Ceramic Capacitor, 10V| 4| 1210| Murata| GRM32ER71A476KE15L
C7| 10nF| Ceramic Capacitor, 25V, X7R| 1| 603| Wurth Electronics| 885012206065
R1| 52.3K0| SMD Resistor, 1%| 1| 603| Panasonic| ERJ-3EKF5232V
R2| 101<0| SMD Resistor, 1%| 1| 603| Panasonic| ERJ-3EKF1002V
R3, R7, R9| 0| SMD Resistor, 1%| 3| 603| Panasonic| ERJ-3GEYOROOV
R4| 100K0| RES SMD 1% 1/10W| 1| 603| Yageo| RC0603FR-07100KL
R6| 200K0| RES SMD 1% 1/10W| 1| 603| Yageo| RC0603FR-07200KL
L1| 6.8pH| DCR=20.4m0, Ir=8.9A| 1| 10.4×10.7x4mm| Panasonic| ETQ-P4M6R8KVC
JH6| | PCB Header, 40 POS| 1| 1X3| 3M| 2340-6111TG
VIN, VOUT, GND x 2| 1598| Terminal Turret Triple 0.094″ L (Test Points)| 4| Through-Hole| Keystone Electronics| 1598-2
U1| AP64502| Sync DC-DC Converter| 1| SO-8EP| Diodes Incorporated (Diodes)| AP64502SP

TYPICAL PERFORMANCE CHARACTERISTICS

IMPORTANT NOTICE

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2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diodes’ products. Diodes’ products may be used to facilitate safety-related applications; however, in all instances customers and users are responsible for (a) selecting the appropriate Diodes products for their applications, (b) evaluating the suitability of Diodes’ products for their intended applications, (c) ensuring their applications, which
   incorporate Diodes’ products, comply the applicable legal and regulatory requirements as well as safety and functional-safety related standards, and (d) ensuring they design with appropriate safeguards (including testing, validation, quality control techniques, redundancy, malfunction prevention, and appropriate treatment for aging degradation) to minimize the risks associated with their applications.

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© 2024 Diodes Incorporated. All Rights Reserved.
www.diodes.com
AP64502SP-EVM
Rev. 1
www.diodes.com
February 2024
© 2024 Copyright Diodes Incorporated.
All Rights Reserved.

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| DIODES AP64502SP-EVM Low IQ Synchronous DC-DC Buck Converter [pdf] Owner's Manual
AP64502SP-EVM Low IQ Synchronous DC-DC Buck Converter, AP64502SP-EVM, Low IQ Synchronous DC-DC Buck Converter, Synchronous DC-DC Buck Converter, DC-DC Buck Converter, Buck Converter, Converter
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