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AP64500 Datasheet(PDF) 22 Page - Diodes Incorporated

Part # AP64500
Description  3.8V TO 40V INPUT, 5A LOW IQ SYNCHRONOUS BUCK WITH PROGRAMMABLE FREQUENCY
PDF  26 Pages
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AP64500 Datasheet(HTML) 22 Page - Diodes Incorporated

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AP64500
Document number: DS41979 Rev. 4 - 2
22 of 26
www.diodes.com
August 2019
© Diodes Incorporated
AP64500
Application Information (cont.)
16
External Loop Compensation Design (cont.)
AP64500
VIN
EN
SW
BST
FB
GND
INPUT
R1
115kΩ
C4
47pF
R2
22.1kΩ
L
3.6μH
C3
100nF
C2
3 x 22µF
C1
10µF
OUTPUT
VOUT
5V
RT/CLK
COMP
R5
15.8kΩ
C5
2.7nF
RT
200kΩ
C6
39pF
VIN
12V
Figure 29. Example Circuit with Calculated Component Values for Loop Compensation
The first-order calculated loop response has the following characteristics:
Bandwidth is around 13.8kHz
Phase Margin is around 101.0°
Gain Margin is around -23.5dB
Figure 30. Closed-Loop Bandwidth
Figure 31. Closed-Loop Phase Margin
-100
-80
-60
-40
-20
0
20
40
60
80
100
100
1,000
10,000
100,000
1,000,000
Frequency (Hz)
-250
-200
-150
-100
-50
0
50
100
150
200
250
100
1,000
10,000
100,000
1,000,000
Frequency (Hz)



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