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ST1S32 Datasheet(PDF) 12 Page - STMicroelectronics

No. de pieza ST1S32
Descripción Electrónicos  4 A DC step-down switching regulator
PDF  29 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1S32 Datasheet(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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