AP63200QWU-EVM Synchronous DC-DC Buck Converter with Enhanced EMI Reduction
Product Information:
Product Name: AP63200QWU-EVM
Description: The AP63200QWU-EVM is a 32V, 2A synchronous
buck converter with enhanced EMI reduction. It features a wide
input voltage range of 3.8V to 32V and integrates a high-side power
MOSFET and a low-side power MOSFET for efficient step-down DC-DC
conversion. The device utilizes peak current mode control and an
integrated compensation network to minimize the external component
count.
Features:
- Switching Frequency: 500kHz
- 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:
- Undervoltage Lockout (UVLO)
- Cycle-by-Cycle Peak Current Limit
- Thermal Shutdown
Product Usage Instructions:
- Connect a power supply to the input terminals VIN and GND.
- Set the input voltage (VIN) to the desired value within the
recommended operating range of 3.8V to 32V. - For Enable/Disable functionality, place a jumper in the H
position to enable the IC and in the L position to disable it. - Connect the positive terminal of an electronic load to the VOUT
terminal and the negative terminal to GND. - Ensure the evaluation board is powered up and observe the
output voltage (VOUT). - Adjust the load to the desired current value, up to a maximum
of 2A, using the electronic load. - Monitor the SW signal on an oscilloscope for stable operation
and measure the switching frequency if needed.
Measurement/Performance Guidelines:
- 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.
AP63200QWU-EVM
32V, 2A, SYNCHRONOUS DC-DC BUCK CONVERTER WITH ENHANCED EMI REDUCTION
DESCRIPTION
The AP63200Q 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 AP63200Q 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 AP63200Q has designs optimized for 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, which further reduces high-frequency radiated EMI noise caused by MOSFET switching.
The device is available in a 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) 500kHz 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
AP63200QWU-EVM
Rev. 2
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FUNCTIONAL BLOCK
AP63200QWU-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
+160
°C
+260
°C
AP63200QWU-EVM
Rev. 2
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AP63200QWU-EVM
32V, 2A, SYNCHRONOUS DC-DC BUCK CONVERTER WITH ENHANCED EMI REDUCTION
ESD Susceptibility
HBM
Human Body Mode
2000
V
CDM
Charge Device Model
1500
V
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
VIN
Supply Voltage
3.8
TA
Operating Ambient Temperature Range
-40
TJ
Operating Junction Temperature Range
-40
Max
Unit
32
V
+125
°C
+150
°C
EVALUATION BOARD
Figure 2. AP63200QWU-EVM
AP63200QWU-EVM
Rev. 2
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AP63200QWU-EVM
32V, 2A, SYNCHRONOUS DC-DC BUCK CONVERTER WITH ENHANCED EMI REDUCTION
QUICK START GUIDE
The AP63200QWU-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP63200QWU, follow the procedure below:
1. For 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 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 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 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:
(1) Setting the output voltage
The AP63200QWU 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,
VOUT
0.8
R1 R3 R1
First, select a value for R1 according to the value recommended in the table 1. Then, R3 is determined. The output voltage is given by Table 1 for reference. For accurate output voltage, 1% tolerance is required.
AP63200QWU-EVM
Rev. 2
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© Diodes Incorporated
AP63200QWU-EVM
32V, 2A, SYNCHRONOUS DC-DC BUCK CONVERTER WITH ENHANCED EMI REDUCTION
Table 1. Recommended Component Selections
(2) Output feed-forward capacitor selection The AP63200QWU 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 degree. However, if the output capacitor has ultra-low ESR, the converter results in 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, fC . The feed-forward capacitor is given by
Table 1 for reference. The feed-forward capacitor is calculated as below,
1
f C4 2 C R3
EVALUATION BOARD SCHEMATIC
Figure 3. AP63200QWU-EVM Schematic
AP63200QWU-EVM
Rev. 2
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© Diodes Incorporated
AP63200QWU-EVM
32V, 2A, SYNCHRONOUS DC-DC BUCK CONVERTER WITH ENHANCED EMI REDUCTION
BILL OF MATERIALS for AP63200QWU-EVM (VOUT=12V)
Item C1 C2 C3 C4 C5 C6 C7 C8 L1 R1 R2 R3 R4 R5 R6 U1
Value
10Uf 0.1Uf 100pF 0.1Uf 22Uf 22Uf
10uH 30K
158K 0
Type
Rating
X7R, Ceramic/1206 Ceramic/0603 Ceramic/0603 Ceramic/0603 X8L, Ceramic/1206 X8L, Ceramic/1206
50V 50V 100V 50V 16V 16V
0603
1%
0603
1%
0603
1%
AP63200QWU
Description Input CAP Input CAP Input CAP Feedback CAP Bootstrap CAP Output CAP Output CAP Output CAP Inductor
Bootstrap RES Bootstrap RES
TSOT23-6
*Note: The present value of R3/R1 are based on Vout=5V
Description open CGA5L1X7R1H106K160AC GCM188L81H104KA57 GCM1885G2A101JA16 GCM188L81H104KA57 CGA6P1X8L1C226M250AC CGA6P1X8L1C226M250AC open Panasonic ETQP3M100KVP ERJ3EKF3002V open ERJ3EKF1583V ERJ-3GEY0R00V open
open Diodes BCD
TYPICAL PERFORMANCE CHARACTERISTICS
AP63200QWU-EVM
Rev. 2
Figure 4. Efficiency vs Output Current
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AP63200QWU-EVM
32V, 2A, SYNCHRONOUS DC-DC BUCK CONVERTER WITH ENHANCED EMI REDUCTION
Figure 5. Output Ripple for VIN=12V, VOUT=5.0V, IOUT=50mA
Figure 6. Output Ripple for VIN=12V, VOUT=5.0V, IOUT=2A
AP63200QWU-EVM
Rev. 2
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June 2023
© Diodes Incorporated
AP63200QWU-EVM
32V, 2A, SYNCHRONOUS DC-DC BUCK CONVERTER WITH ENHANCED EMI REDUCTION
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