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AP64351 Datasheet(PDF) 22 Page - Diodes Incorporated

Part # AP64351
Description  3.8V TO 40V INPUT, 3.5A LOW IQ SYNCHRONOUS BUCK WITH PROGRAMMABLE SOFT-START TIME
PDF  26 Pages
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AP64351 Datasheet(HTML) 22 Page - Diodes Incorporated

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AP64351
Document number: DS41977 Rev. 4 - 2
22 of 26
www.diodes.com
August 2019
© Diodes Incorporated
AP64351
Application Information (cont.)
16
External Loop Compensation Design (cont.)
AP64351
VIN
EN
SW
BST
FB
GND
INPUT
R1
115kΩ
C4
33pF
R2
22.1kΩ
L
5.5μH
C3
100nF
C2
2 x 22µF
C1
10µF
OUTPUT
VOUT
5V
COMP
R5
14kΩ
C5
3.3nF
C6
39pF
SS
Css
10nF
VIN
12V
Figure 28. Example Circuit with Calculated Component Values for Loop Compensation
The first-order calculated loop response has the following characteristics:
Bandwidth is around 16.6kHz
Phase Margin is around 82.0°
Gain Margin is around -27.1dB
Figure 29. Closed-Loop Bandwidth
Figure 30. 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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