DIODES AP64102QSP-EVM 40V 1A Low IQ Synchronous DC Buck Converter User Guide

DIODES AP64102QSP-EVM 40V 1A Low IQ Synchronous DC Buck Converter User Guide

DESCRIPTION

The AP64102Q is an automotive-compliant, 1A, synchronous buck converter with a wide input voltage range of 3.8V to 40V. The device fully integrates a 150mΩ high-side power SAMOSET and a 80mΩ low-side power SAMOSET to provide high- efficiency step-down DC-DC conversion.

The AP64102Q device is easily used by minimising the external component count due to its adoption of peak current mode control along with its integrated loop compensation network.

The AP64102Q design is optimised for Electromagnetic Interference (EMI) reduction.
The device has a proprietary gate driver scheme to resist switching node ringing without sacrificing SAMOSET turn-on and turn-off times, which reduces high-frequency radiated EMI noise caused by SAMOSET switching. The AP64102Q also features Frequency Spread Spectrum (FSS) with a switching frequency hitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time.

The device is available in an SO-8EP package.

FEATURES

• AEC-Q100 Qualified
• Wide Input Range: 3.8V to 40V
• 1A Continuous Output Current
• 0.8V ±1% Reference Voltage
• 25µA Ultra low Quiescent Current (Pulse Frequency Modulation)
• Programmable Switching Frequency: 100kHz to 2.2MHz
• External Clock Synchronisation: 100kHz to 2.2MHz
• Adjustable Soft-Start Time
• Proprietary Gate Driver Design for Best EMI Reduction
• Frequency Spread Spectrum (FSS) to Reduce EMI
• 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
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device

APPLICATIONS

• Automotive Power Systems
• Automotive Infotainment
• Automotive Instrument Clusters
• Automotive Telematics
• Automotive Lighting Control
• Advanced Driver Assistance Systems

TYPICAL APPLICATIONS CIRCUIT

Figure 1. Typical Application Circuit

ABSOLUTE MAXIMUM RATINGS

-0.3 to +45.0 (400ms)
VBST| Bootstrap Pin Voltage| VSW – 0.3 to VSW + 6.0| V
VEN| Enable/UVLO Pin Voltage| -0.3 to +42.0| V
VRT/CLK| RT/CLK Pin Voltage| -0.3 to +6.0| V
VFB| Feedback Voltage| -0.3V to +6.0| V
VSS| Soft-Start Pin Voltage| -0.3 to +6.0| V
VSW| Switch Node Voltage| -0.3 to VIN + 0.3 (DC)| V
-2.5 to VIN + 2.0 (20ns)
TJ| Junction Temperature| +160| °C
TL| Lead Temperature| +260| °C

RECOMMENDED OPERATING CONDITIONS

EVALUATION BOARD

QUICK START GUIDE

The AP64102QSP-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP64102QSP, 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, to enable IC, place a jumper at JH6 to “ON” position to connect EN pin to VIN through 100KΩ resistor 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 1A 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 OUTPUT VOLTAGE:

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

Table 1. Common Output Voltages

EVALUATION BOARD SCHEMATIC

Figure 3. AP64102QSP-EVM Schematic

PCB TOP LAYOUT

Figure 4. AP64102QSP-EVM – Top Layer

PCB BOTTOM LAYOUT

Figure 5. AP64102QSP-EVM – Bottom Layer

BILL OF MATERIALS for AP64102QSP-EVM for VOUT=5V

Ref| Value| Description| Qty| Size| Vendor Name| Manufacturer PN
---|---|---|---|---|---|---
C1, C2| 10µF| Ceramic Capacitor, 50V| 2| 1206| TDK| CGA5L1X7R1H106K160AC
C3, C4, C9| 0.1µF| Ceramic Capacitor, 50V| 3| 0603| TDK| CGA3E3X8R1H104K080AB
C5| 22µF| Ceramic Capacitor, 16V| 1| 1210| TDK| CGA6P1X8L1C226M250AC
C7| 10nF| Ceramic Capacitor, 50V| 1| 0603| TDK| CGA3E2NP01H103J080AA
R1| 52.3KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF5232V
R2| 10KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF1002V
R3, R7, R9| 0Ω| SMD Resistor, 1%| 3| 0603| Panasonic| ERJ-3GEY0R00V
R4| 100KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-3EKF1003V
---|---|---|---|---|---|---
R6| 200KΩ| SMD Resistor, 1%| 1| 0603| Panasonic| ERJ-S03F2003V
L1| 15µH| DCR=69.5mΩ, Ir=2.2A| 1| 7.4×7.3×4.5mm| Wurth Electronics| 7447773150
JH6| | PCB Header, 36 POS| 1| 1X3| Amphenol| 78511-136HLF
JH13, JH14,JH15, JH16| 1598| Terminal Turret Triple 0.094″ L (Test Points)| 4| Through- Hole| Keystone Electronics| 1598-2
U1| AP64102Q| Sync DC-DC Converter| 1| SO-8EP| Diodes Incorporated (Diodes)| **** AP64102QSP

TYPICAL PERFORMANCE CHARACTERISTICS

Figure 6. Efficiency vs. Output Current

Figure 7. Load Transient 0.5A to 1A

Figure 8. Output Voltage Ripple, IOUT=1A

Figure 9. Output Short Protection, IOUT=1A

IMPORTANT NOTICE

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