DIODES AP62400WU-EVM 18V Buck Converter Cot Synchronous DC Instruction Manual

DIODES AP62400WU-EVM 18V Buck Converter Cot Synchronous DC

Specifications:

• Input Voltage Range: 4.2V to 18V
• Output Current: 4A
• Integrated high-side power MOSFET: 50mΩ
• Integrated low-side power MOSFET: 22mΩ
• Control: Constant On-Time (COT)
• Package: TSOT26

Product Usage Instructions

Setting Output Voltage:

To set the output voltage, refer to Table 1 for component selections based on the desired output voltage.

Quick Start Guide:

1. Connect the power supply to VIN and GND with VIN set to 12V.
2. Connect the electronic load to VOUT and GND.
3. Enable the IC by placing a jumper at JH8 to the ON position.

Measurement/Performance Guidelines:

1. For measuring output voltage ripple, ensure short ground lengths on the oscilloscope probe.
2. For efficiency measurements, use an ammeter in series with the input supply and an electronic load for output current.

FAQ

• Q: What is the recommended input voltage range for the AP62400?
  • A: The recommended input voltage range is 4.2V to 18V.
• Q: How can I reduce high-frequency radiated EMI noise?
  • A: The device is optimized for EMI reduction, but you can further minimize noise by following proper layout and grounding techniques.

DESCRIPTION

The AP62400 is a 4A, synchronous buck converter with a wide input voltage range of 4.2V to 18V. The device fully integrates a 50mΩ high-side power MOSFET and a 22mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion.
The AP62400 is easily used by minimizing 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 AP62400 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 AP62400 is available in the TSOT26 package.

FEATURES

• VIN: 4.2V to 18V
• Output Voltage (VOUT): 0.8V to 7V
• 4A Continuous Output Current
• 0.8V ± 1% Reference Voltage (TA = +25°C)
• 190μA Low Quiescent Current (Pulse Frequency Modulation)
• 800kHz Switching Frequency (VIN = 12V, VOUT = 5V)
• 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

APPLICATIONS

• 5V and 12V distributed power bus supplies
• Flat screen TV sets and monitors
• White goods and small home appliances
• FPGA, DSP, and ASIC supplies
• Home audio
• Network systems
• Gaming consoles
• Consumer electronics
• General-purpose point of loads

ABSOLUTE MAXIMUM RATINGS

VIN

| ****

Supply Pin Voltage

| -0.3 to +20.0 (DC)| ****

V

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

EVALUATION BOARD

QUICK START GUIDE

The AP62400WU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP62400, follow the procedure below:

1. Connect the 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. The evaluation board should now power up with a 5.0V output voltage.
4. 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.
5. Set the load to 4A for AP62400 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

LAYOUT

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

BILL OF MATERIALS for AP62400WU-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| 0.1µF| Ceramic Capacitor, 50V, X7R, 10%| 1| 0603| KEMET| C0603C104K5RACTU
C6| 0.33µF| Ceramic Capacitor, 16V, X7R, 10%| 1| 0603| Samsung| CL10B334KO8NNNC
L1| 2.2µH| DCR=20mΩ, Ir=4.2A| 1| 7.3×7.3x

4.5mm

| Wurth Electronics| 7447779002
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, 40 POS| 1| 1X3| Wurth Electronics| 61304011121
U1| AP62400| Sync Buck DC/DC converter| 1| TSOT26| Diodes Inc| AP62400WU-7

TYPICAL PERFORMANCE CHARACTERISTICS

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