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ST1S32 데이터시트(PDF) 12 Page - STMicroelectronics

부품명 ST1S32
상세설명  4 A DC step-down switching regulator
PDF  29 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1S32 데이터시트(HTML) 12 Page - STMicroelectronics

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Functional description
ST1S32
12/29
Doc ID 023246 Rev 1
Equation 12
So, closing the loop, the loop gain GLOOP(s) is:
Equation 13
Example:
VIN=5 V, VOUT=1.2 V, Iomax=4 A, L=1.0 uH, Cout=47 uF (MLCC), R1=10 k
Ω, R2=20
k
Ω (see Section 5.2 and Section 5.3 for inductor and output capacitor selection
guidelines).
The module and phase Bode plot are reported in Figure 6.
The bandwidth is 117 kHz and the phase margin is 63 degrees.
Figure 6.
Module Bode plot
f
Z
36 2 kHz
,
=
f
P LF
30 Hz
=
G
LOOP s
()
G
CO s
() G
DIV s
() G
EA s
()
⋅⋅
=
0.1
1
10
100
1 .10
3
1 .10
4
1 .10
5
1 .10
6
1 .10
7
60
42
24
6
12
30
48
66
84
102
120
Frequency [Hz]
AM11420v1



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