DIODES AP62200TWU-EVM 18V 2A Low Iq COT Synchronous DC-DC Buck Converter User Manual

DIODES AP62200TWU-EVM 18V 2A Low Iq COT Synchronous DC-DC Buck Converter

Product Information:

• Product Name: AP62200TWU-EVM
• Type: Synchronous DC-DC Buck Converter
• Input Voltage Range: 4.2V to 18V
• Output Current: 2A
• Control Method: Constant On-Time (COT)

Package: TSOT26

Features:

• High-efficiency step-down DC-DC conversion
• Fast transient response – Easy loop stabilization
• Low output voltage ripple
• EMI reduction
• Undervoltage Lockout (UVLO)
• Cycle-by-Cycle Valley Current Limit
• Thermal Shutdown

Applications:

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

Product Usage Instructions:

1. Setting Output Voltage: – Refer to Table 1 for component selections for common output voltages. – Choose the appropriate resistors R1 and R2 based on the desired output voltage. – Choose the inductor L1 based on the recommended values.
2.  Evaluation
   Board Setup: – Connect a power supply to the input terminals VIN and GND. Set VIN to 12V. – Connect the positive terminal of the electronic load to VOUT and the negative terminal to GND. – For Enable, place a jumper at JH8 to the ON position to connect the EN pin to VIN through a 100K resistor to enable the IC. Leave it OPEN to disable the IC. Note: Refer to the user manual for more detailed instructions, safety precautions, and additional information about the product.

DESCRIPTION

The AP62200T 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 AP62200T 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 AP62200T 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.
AP62200T is available in a TSOT26 package.

FEATURES

• VIN Range: 4.2V -18V
• Output Voltage range: 0.8V to 7V
• 2A Continuous Output Current
• 0.7625V ± 1% Reference Voltage (TA = +25°C) => AP62200T
• 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

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

-40 to +85

| °C
TJ| Operating Junction Temperature| ****

-40 to +125

| °C

SETTING OUTPUT VOLTAGE

Table 1 for AP62200T shows a list of recommended component selections for common output voltages.

Table 1. Common Output Voltages (AP62200T)

EVALUATION BOARD

QUICK START GUIDE

The AP62200TWU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP62200TWU, 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

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

BILL OF MATERIALS for AP62200TWU-EVM for VOUT=5V

Ref| Value| Description| Qty| Size| Vendor Name| Manufacturer PN
---|---|---|---|---|---|---

C1

| ****

10µF

| Ceramic Capacitor,

25V, X5R

| ****

1

| ****

1210

| ****

Murata

| ****

GRM32DR61E106KA12L

C2, C3

| ****

22µF

| Ceramic Capacitor, 25V, X5R| ****

2

| ****

1210

| ****

AVX

| ****

12103D226KAT2A

C4, C6

| ****

0.1µF

| Ceramic Capacitor,

50V, X7R, 10%

| ****

2

| ****

0603

| ****

Samsung

| ****

GCJ188R71H104KA12D

L1

| ****

4.7µH

| DCR=19.5mΩ, Ir=6.2A| ****

1

| 10.2X10.

2×4.5mm

| Wurth Electronics| ****

744779747

R1| 56.2KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF5622V
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

| ****

3M

| ****

2340-6111TG

U1

| ****

AP62200T

| Sync Buck DC/DC converter| ****

1

| ****

TSOT26

| ****

Diodes Inc

| ****

AP62200TWU-7

TYPICAL PERFORMANCE CHARACTERISTICS

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18%, ZA, Low l9, COT Synchronous DC-DC Buck Converter

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