DIODES AP62300WU-EVM COT Synchronous DC-DC Buck Converter Owner’s Manual

DIODES AP62300WU-EVM COT Synchronous DC-DC Buck Converter Owner’s Manual

DESCRIPTION

The AP62300 is a 3A, 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 AP62300 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 AP62300 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.

AP62300 is available in a TSOT26 package.

FEATURES

• VIN Range: 4.2V -18V
• Output Voltage range: 0.8V to 7V
• 3A Continuous Output Current
• 0.8V ± 1% Reference Voltage (TA = +25°C) => AP62300
• 155µA Low Quiescent Current
• 750kHz Switching Frequency
• Up to 83% Efficiency at 5mA Light Load
• 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
• Consumer Electronics
• Network Systems
• General Purpose Point of Load

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 AP62300 shows a list of recommended component selections for common output voltages.

Table 1. Common Output Voltages

EVALUATION BOARD

Figure 1. AP62300WU-EVM

QUICK START GUIDE
The AP62300WU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP62300WU, 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 3A 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.

BOOTSTRAP CAPACITOR GUIDELINES:
To ensure proper operation, a ceramic capacitor must be connected between the BST and SW pins to supply the drive voltage for the high-side power MOSFET. A 100nF ceramic capacitor is sufficient for most applications. In the cases where output voltage is higher than 2.5V, a higher capacitance is recommended to help maintain stable voltage from BST to SW. Please refer to Tables 1 for details.

EVALUATION BOARD SCHEMATIC

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

BILL OF MATERIALS for AP62300WU-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| C1210C226K3RAC780 0
C4| 0.1µF| Ceramic Capacitor,50V, X7R, 10%| 1| 0603| KEMET| C0603C104K5RACTU
C6| 0.33µF| Ceramic Capacitor, 16V, X7R, 10%| 1| 0603| Samsung| CL10B334KO8NNNC
L1| 3.3µH| DCR=10.5mΩ, Ir=7.5A| 1| 10x10x 5mm| Wurth Electronics| 7447714033
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 TurretTriple 0.094″ L (Test Points)| **** 4| **** Through- Hole| **** Keystone Circuit| **** 1598-2
JH8| | PCB Header, 40POS| 1| 1X3| 3M| 2340-6111TG
U1| AP62300| Sync BuckDC-DC converter| 1| TSOT26| Diodes Incorporated| AP62300WU-7

TYPICAL PERFORMANCE CHARACTERISTICS

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