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AST1S31HF Fiches technique(PDF) 15 Page - STMicroelectronics

No de pièce AST1S31HF
Description  Internal soft-start and enable
PDF  33 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AST1S31HF Fiches technique(HTML) 15 Page - STMicroelectronics

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AST1S31HF
Functional description
33
So closing the loop the loop gain GLOOP(s) is:
Equation 15
Example:
VIN = 3.3 V, VOUT = 1.2 V, Iomax = 3 A, L = 0.91
H, Cout = 22 F (MLCC),
R1 = 100 k
, R2 = 200 k(see Section 7.2 on page 20 and Section 7.3 on page 21 for
inductor and output capacitor selection guidelines).
The module and phase Bode plot are reported in Figure 7.
The bandwidth is 230 kHz and the phase margin is 70 degrees.
Figure 7. Module and phase Bode plot
GLOOP s

GCO s
 G
DIV s
 G
EA s


=
0.1
1
10
100
110
3
110
4
110
5
110
6
110
7
60
42
24
6
12
30
48
66
84
102
120
Frequency [Hz]
0.1
1
10
100
110
3
110
4
110
5
110
6
110
7
210
182.5
155
127.5
100
72.5
45
17.5
10
Frequency [Hz]



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