DIODES AP63301QWU-EVM Automotive Compliant 32v 3a Low Iq Synchronous Buck Converter Installation Guide

DIODES AP63301QWU-EVM Automotive Compliant 32v 3a Low Iq Synchronous Buck

Converter

DESCRIPTION

The AP63301Q is an automotive-compliant 3A, synchronous buck converter with a wide input voltage range of 3.8V to 32V. The device fully integrates a 75mΩ high-side power MOSFET and a 40mΩ low-side power MOSFET to provide high- efficiency step-down DC-DC conversion. The AP63301Q device is easily used by minimizing the external component count due to its adoption of peak current mode control along with its integrated loop compensation network. The AP63301Q 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 device is available in a TSOT26 package.

FEATURES

• AEC-Q100 Qualified for Automotive Applications
• Device Temperature Grade 1: -40°C to +125°C TA Range
• VIN 3.8V to 32V
• Output Voltage (VOUT): 0.8V to VIN
• 3A Continuous Output Current
• 0.8V ± 1% Reference Voltage
• 22μA Ultralow Quiescent Current (Pulse Frequency Modulation)
• 500kHz Switching Frequency
• Pulse Width Modulation (PWM) Regardless of Output Load
• Proprietary Gate Driver Design for Best EMI Reduction
• Low-Dropout (LDO) Mode
• Precision Enable Threshold to Adjust UVLO
• Protection Circuitry
• Undervoltage Lockout (UVLO)
• Output Overvoltage Protection (OVP)
• Cycle-by-Cycle Peak Current Limit
• Thermal Shutdown

APPLICATIONS

• Automotive Power Systems
• Automotive Infotainment
• Automotive Instrument Clusters
• Automotive Body Electronics and Lighting
• Automotive Telematics
• Advanced Driver Assistance Systems

FUNCTIONAL BLOCK

ABSOLUTE MAXIMUM RATINGS

-0.3 to +40.0 (400ms)
VFB| Feedback Voltage| -0.3V to +6.0| V
VEN| Enable/UVLO Pin Voltage| -0.3 to +35.0| V
VSW| Switch Node Voltage| -0.3 to VIN + 0.3 (DC)| V
-2.5 to VIN + 2.0 (20ns)| V
VBST| Bootstrap Pin Voltage| VSW – 0.3 to VSW + 6.0| V
TST| Storage Temperature| -65 to +150| °C
TJ| Junction Temperature| +160| °C
TL| Lead Temperature| +260| °C
ESD Susceptibility (Note 5)
HBM| Human Body Mode| 2000| V
CDM| Charged Device Model| 1000| V

RECOMMENDED OPERATING CONDITIONS

EVALUATION BOARD

QUICK START GUIDE
The AP63301QWU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP63301Q, follow the procedure below:

1. For the evaluation board configured at VOUT=5V, 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 in the “H” position to enable IC. Jump to the “L” position to disable IC.
4. The evaluation board should now power up with a 5V output voltage.
5. Check for the proper output voltage of 5V (±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. Setting the Output Voltage of AP63301Q

Setting the output voltage
The AP63301Q features external programmable output voltage by using a resistor divider network R3 and R1 as shown in the typical application circuit. The output voltage is calculated as below, First, select a value for R1 according to the value recommended in Table 1. Then, R3 is determined. The output voltage is given in Table 1 for reference. For accurate output voltage, 1% tolerance is required.

Output feed-forward capacitor selection
The AP63301Q has the internal integrated loop compensation as shown in the function block diagram. The compensation network includes an 18k resistor and a 7.6nF capacitor. Usually, the type II compensation network has a phase margin between 60 and 90 degrees. However, if the output capacitor has ultra- low ESR, the converter results in a low phase margin. To increase the converter phase margin, a feed-forward cap C4 is used to boost the phase margin at the converter cross-over frequency  The feed-forward capacitor is given in Table 1 for reference. The feed-forward the capacitor is calculated as below,

Table 1. Resistor selection for output voltage setting

EXTERNAL COMPONENT SELECTION

1. Input & output Capacitors (Cin, Cout)
2. For lower output ripple, low ESR is required.
3. Low leakage current needed multiple capacitor parallel connection.
4. The Cin and Cout capacitances are greater than 10μF and 44μF respectively.
5. Bootstrap Voltage Regulator
6. An external 0.1μF ceramic capacitor is required as a bootstrap capacitor between the BST and SW pin to work as a high-side power MOSFET gate driver.
7. Inductor (L)
8. Low DCR for good efficiency
9. The inductance saturate current must be higher than the output current
10. The recommended inductance is shown in Table 2 below.

EVALUATION BOARD SCHEMATIC

PCB TOP LAYOUT

PCB BOTTOM LAYOUT

BILL OF MATERIALS for AP63301QWU-EVM
Table 2

Ceramic/1206

| 35V| Input CAP| TDK

CGA5L1X7R1V106K160AC

C3| 0.1µF| X8R,

Ceramic/0603

| 50V| Input CAP| TDK

CGA3E3X8R1H104K080AB

C4| 100pF| C0G,

Ceramic/0603

| 50V| Feedback CAP| TDK

CGA3E2C0G1H101J080AA

C5| 0.1µF| X8R,

Ceramic/0603

| 50V| Bootstrap CAP| TDK

CGA3E3X8R1H104K080AB

C6 & C7| 22µF| X7R,

Ceramic/1206

| 10V| Output CAP| TDK

CGA5L1X7S1A226M160AC

L1| 6.8µH| 6060| 6.5A| Inductor| Würth PART 744 393 690 68
R1| 30K| 0603| 1%| Voltage set RES*|
R3| 162K| 0603| 1%|
R4| 0| 0603| 1%| Bootstrap RES|
R5| 100K| 0603| 1%| EN pull high RES|
U1| | AP63301Q| | TSOT23-6| Diodes BCD

Note

• The present value of R3/R1 is based on
• Vout=5.0

TYPICAL PERFORMANCE CHARACTERISTICS

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