DIODES AP62250WU-EVM COT Synchronous DC-DC Buck Converter

DESCRIPTION

• The AP62250 is a 2.5A, synchronous buck converter with a wide input voltage range of 4.2V to 18V. The device fully integrates a 75mΩ high-side power MOSFET and a 45mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.
• The AP62250 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 AP62250 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.
• AP62250 is available in TSOT26 packages.

FEATURES

• VIN Range: 4.2V -18V
• Output Voltage Range: 0.8V to 7V
• 2.5A Continuous Output Current
• 0.8V ± 1% Reference Voltage (TA = +25°C)
• 155μA Low Quiescent Current
• 1.3MHz 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
• White Goods and Small Home Appliances
• 5V and 12V Distributed Power Bus Supplies
• FPGA, DSP, and ASIC Supplies
• Home Audio
• Network Systems
• Gaming Consoles
• Consumer Electronics
• General Purpose Point of Load

TYPICAL APPLICATIONS CIRCUIT

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

SETTING OUTPUT VOLTAGE:

Table 1 for AP62250 shows a list of recommended component selections for common output voltages.

Table 1. Common Output Voltages

EVALUATION BOARD

QUICK START GUIDE

The AP62250WU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP62250WU, 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 the negative terminal to GND.
3. For Enable, place a jumper at JH8 to the “ON” position to connect the EN pin to VIN through the 100KΩ resistor to enable IC or leave it OPEN. Jump to the “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 2.5A 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.

EVALUATION BOARD SCHEMATIC

PCB TOP/BOTTOM LAYOUT

PCB TOP/BOTTOM LAYOUT

BILL OF MATERIALS for AP62250WU-EVM for VOUT=5V

TYPICAL PERFORMANCE CHARACTERISTICS

IMPORTANT NOTICE

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Documents / Resources

DIODES AP62250WU-EVM COT Synchronous DC-DC Buck Converter [pdf] Owner's Manual AP62250, AP62250WU-EVM COT Synchronous DC-DC Buck Converter, AP62250WU-EVM, COT Synchronous DC-DC Buck Converter, Synchronous DC-DC Buck Converter, DC-DC Buck Converter, Buck Converter, Converter

References

• User Manual