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ST1S32 Arkusz danych(PDF) 12 Page - STMicroelectronics

Numer części ST1S32
Szczegółowy opis  4 A DC step-down switching regulator
PDF  29 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1S32 Arkusz danych(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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