AP63203QWU-EVM 32V 2A Synchronous DC-DC Buck Converter with Enhanced EMI Reduction
Product Information
The AP63203QWU-EVM is a 32V, 2A synchronous DC-DC buck converter
with enhanced EMI reduction. It features a wide input voltage range
of 3.8V to 32V and integrates a 125m high-side power MOSFET and a
68m low-side power MOSFET for high-efficiency step-down DC-DC
conversion. The device utilizes peak current mode control and an
integrated compensation network to minimize the external component
count.
The AP63203QWU-EVM is a fixed output buck converter with
Electromagnetic Interference (EMI) reduction. It supports both
Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM)
and features Frequency Spread Spectrum (FSS) to reduce EMI. The
converter has a switching frequency of 1.1MHz and a proprietary
gate driver design for optimal EMI reduction. It also includes
protection circuitry such as undervoltage lockout (UVLO),
cycle-by-cycle peak current limit, and thermal shutdown. The device
is available in the low-profile TSOT26 package.
Product Usage Instructions
- Connect a power supply to the input terminals VIN and GND of
the evaluation board. - Set the input voltage (VIN) to the desired value within the
range of 3.8V to 32V. - If evaluating at a specific output voltage, ensure the load is
connected accordingly. - Measure the output voltage using a multimeter by connecting its
positive and negative leads between VOUT and GND. - To measure the output voltage ripple, use an oscilloscope with
the shortest possible ground lengths on the probe to minimize noise
injection. - Set the load to the desired value, up to 2A, using an
electronic load. - Monitor the SW signal on the oscilloscope to check for stable
operation and measure the switching frequency.
Note: Refer to the product manual for additional guidelines,
specifications, and safety precautions.
AP63203QWU-EVM
32V, 2A, Synchronous DC-DC Buck Converter With Enhanced EMI Reduction
DESCRIPTION
The AP63203Q is a 2A, synchronous buck converter with a wide input voltage range of 3.8V to 32V and fully integrates a 125m high-side power MOSFET and a 68m lowside power MOSFET to provide highefficiency step-down DC-DC conversion.
The AP63203Q device is easily used by minimizing the external component count due to its adoption of peak current mode control along with its integrated compensation network.
The AP63203Q is a fixed output buck converter with Electromagnetic Interference (EMI) reduction. The converter features Frequency Spread Spectrum (FSS) with a
switching frequency jitter of ±6%, which reduces EMI by not allowing emitted energy to stay in any one frequency for a significant period of time. It also has a proprietary gate driver scheme to resist switching node ringing without sacrificing MOSFET turn-on and turn-off times, further reducing highfrequency radiated EMI noise caused by MOSFET switching.
The device is available in the low-profile TSOT26 package.
FEATURES
VIN 3.8V to 32V 2A Continuous Output Current 0.8V ± 1% Reference Voltage 22µA Low Quiescent Current (Pulse
Frequency Modulation) 1.1MHz Switching Frequency Supports Pulse Frequency
Modulation (PFM) and Pulse Width Modulation (PWM) 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
o Undervoltage Lockout (UVLO)
o Cycle-by-Cycle Peak Current Limit
o Thermal Shutdown
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FUNCTIONAL BLOCK
AP63203QWU-EVM
32V, 2A, Synchronous DC-DC Buck Converter With Enhanced EMI Reduction
Figure 1. Functional Block Diagram
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
VIN
Supply Voltage
VSW
Switch Node Voltage
VBST
Bootstrap Voltage
VFB
Feedback Voltage
VEN
Enable/UVLO Voltage
TST
Storage Temperature
TJ
Junction Temperature
TL
Lead Temperature
Rating
Unit
-0.3 to +35.0 (DC) V
-0.3 to +40.0 (400ms)
-1.0 to VIN + 0.3 (DC) V
-2.5 to VIN + 2.0 (20ns)
VSW – 0.3 to VSW + 6.0
V
-0.3 to +6.0
V
-0.3 to +35.0
V
-65 to +150
°C
+150
°C
+260
°C
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AP63203QWU-EVM
32V, 2A, Synchronous DC-DC Buck Converter With Enhanced EMI Reduction
ESD Susceptibility HBM CDM
Human Body Mode Charge Device Model
RECOMMENDED OPERATING CONDITIONS
Symbol VIN TA TJ
Parameter Supply Voltage Operating Ambient Temperature Range Operating Junction Temperature Range
2000 1000
Min 3.8 -40 -40
V V
Max
Unit
32
V
+125
°C
+150
°C
EVALUATION BOARD
AP63203QWU-EVM
Rev. 1
Figure 2. AP63203QWU-EVM
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AP63203QWU-EVM
32V, 2A, Synchronous DC-DC Buck Converter With Enhanced EMI Reduction
QUICK START GUIDE
The AP63203QWU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP63203QWU, follow the procedure below:
1. For an evaluation board configured at VOUT=3.3V, 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 to “H” position to enable IC. Jump to “L” position to disable IC. 4. The evaluation board should now power up with a 3.3V output voltage. 5. Check for the proper output voltage of 3.3V (±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.
SETTING OUTPUT VOLTAGE:
Setting the output voltage:
The AP63203Q is a fixed output buck converter. The output voltage is 3.3V. Connect VFB pin to output directly as schematic shown.
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EVALUATION BOARD SCHEMATIC
AP63203QWU-EVM
32V, 2A, Synchronous DC-DC Buck Converter With Enhanced EMI Reduction
Figure 3. AP63203QWU-EVM Schematic
BILL OF MATERIALS for AP63203QWU-EVM (VOUT=3.3V)
Item Value C1
C2
10Uf
C3 0.1Uf
Type
X7R, Ceramic/1206 Ceramic/0603
Rating 50V 50V
Description Input CAP Input CAP
Input CAP
C4 100pF Ceramic/0603 100V
Feedback CAP
C5 0.1Uf Ceramic/0603
50V
Bootstrap CAP
C6
22Uf
X8L, Ceramic/1206
16V
C7
22Uf
X8L, Ceramic/1206
16V
C8
L1 3.3µH
R1
R2
R3
0
0603
1%
R4
H EN L
U1
AP63203QWU
Output CAP Output CAP Output CAP
Inductor
Bootstrap RES Wurth Electronics
TSOT23-6
Description open
CGA5L1X7R1H106K160AC
GCM188L81H104KA57
GCM1885G2A101JA16
GCM188L81H104KA57
CGA6P1X8L1C226M250AC
CGA6P1X8L1C226M250AC open
Panasonic ETQP3M3R3KVP
open open ERJ-3GEY0R00V open 61304011121 Diodes BCD
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AP63203QWU-EVM
32V, 2A, Synchronous DC-DC Buck Converter With Enhanced EMI Reduction
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 4. Efficiency vs Output Current
Figure 5. Output Ripple for VIN=12V, VOUT=5.0V, IOUT=50mA
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AP63203QWU-EVM
32V, 2A, Synchronous DC-DC Buck Converter With Enhanced EMI Reduction
Figure 6. Output Ripple for VIN=12V, VOUT=5.0V, IOUT=2A
AP63203QWU-EVM
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AP63203QWU-EVM
32V, 2A, Synchronous DC-DC Buck Converter With Enhanced EMI Reduction
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