DIODES AP62200WU-EVM COT Synchronous DC-DC Buck Converter Instruction Manual

DIODES AP62200WU-EVM COT Synchronous DC-DC Buck Converter Instruction Manual

DESCRIPTION

The AP62200 is a 2A, synchronous buck converter with a wide input voltage range of 4.2V to 18V. The device fully integrates a 90mΩ high-side power MOSFET and a 65mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.

The AP62200 device is easily used by minimizing the external component count due to its adoption of Constant On-Time (COT) control to achieve fast transient response, easy loop stabilization, and low output voltage ripple.

The AP62200 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 highfrequency radiated EMI noise caused by MOSFET switching.

AP62200 is available in a TSOT26 package.

FEATURES

• VIN Range: 4.2V -18V
• Output Voltage range: 0.8V to 7V
• 2A Continuous Output Current
• 0.8V ± 1% Reference Voltage (TA = +25°C) => AP62200
• 135µA Low Quiescent Current
• 740kHz Switching Frequency
• Proprietary Gate Driver Design for Best EMI Reduction
• Protection Circuitry
  • Undervoltage Lockout (UVLO)
  • Cycle-by-Cycle Valley Current Limit
  • Thermal Shutdown
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device

APPLICATIONS

• Flat Screen TV Sets and Monitors
• Set Top Boxes
• Consumer Electronics
• Network Systems
• General Purpose Point of Load

TYPICAL APPLICATIONS CIRCUIT

Figure 1. Typical Application Circuit

ABSOLUTE MAXIMUM RATINGS

-0.3 to 22.0 (400ms)
VSW| Switch Pin Voltage| -1.0 to VIN + 0.3 (DC)| V
-2.5 to VIN + 2.0 (20ns)
VBST| Bootstrap Pin Voltage| VSW – 0.3 to VSW + 6.0| V
VEN| Enable/UVLO Pin Voltage| -0.3 to +6.0| V
VFB| Feedback Pin Voltage| -0.3 to +6.0| V
TST| Storage Temperature| -65 to +150| °C
TJ| Junction Temperature| +150| °C
TL| Lead Temperature| +260| °C
ESD Susceptibility
HBM| Human Body Mode| 2000| V
CDM| Charge Device Model| 500| V

RECOMMENDED OPERATING CONDITIONS

SETTING OUTPUT VOLTAGE

Table 1 for AP 62200 shows a list of recommended component selections for common output voltages.

Table 1. Common Output Voltages

EVALUATION BOARD

Figure 2. AP62200WU-EVM

QUICK START GUIDE

The AP 62200 WU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP 62200WU, 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, place a jumper at JH8 to “ON” position to connect EN pin to VIN through 100KΩ resistor to enable IC 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 2A 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.

EVALUATION BOARD SCHEMATIC

Figure 3. AP62200WU-EVM Schematic

PCB TOP LAYOUT

Figure 4. AP62200WU-EVM – Top Layer

Figure 5. AP62200WU-EVM – Bottom Layer

BILL OF MATERIALS for AP62200WU-EVM for VOUT=5V

Ref| Value| Description| Qty| Size| Vendor Name| Manufacturer PN
---|---|---|---|---|---|---
C1| 10µF| Ceramic Capacitor,25V, X7R, 10%| 1| 1210| KEMET| C1210C106K3RACTU
C2, C3| 22µF| Ceramic Capacitor, 25V, X7R, 10%| 2| 1210| KEMET| C1210C226K3RAC7800
C4, C6| 0.1µF| Ceramic Capacitor,50V, X7R, 10%| 2| 0603| KEMET| C0603C104K5RACTU
L1| 4.7µH| DCR=19.5mΩ, Ir=6.2A| 1| 10.2X10.2×4.5mm| Wurth Electronics| 744779747
R1| 52.3KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF5232V
R2| 10KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF1002V
R3| 0Ω| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3GEY0R00V
R4| 100KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF1003V
JH4, JH5, JH6,JH7| **** 1598| Terminal Turret Triple 0.094″ L(Test Points)| **** 4| Through- Hole| Keystone Circuit| **** 1598-2
JH8| | PCB Header, 40POS| 1| 1X3| 3M| 2340-6111TG
U1| AP62200| Sync Buck DC/DC converter| 1| TSOT 26| Diodes Inc| **** AP62200WU-7

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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AP62200WU-EVM
Rev. 2

9 of 9
www.diodes.com

March 2023
© Diodes Incorporated

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