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ST1S31 датащи(PDF) 13 Page - STMicroelectronics

номер детали ST1S31
подробное описание детали  3 A DC step-down switching regulator
PDF  35 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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ST1S31 датащи(HTML) 13 Page - STMicroelectronics

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DocID022998 Rev 4
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ST1S31
Functional description
35
The embedded compensation network is RC = 80 k, CC = 55 pF while CP and CO can be
considered as negligible. The error amplifier output resistance is 96 M
so the relevant
singularities are:
Equation 13
So closing the loop, the loop gain GLOOP(s) is:
Equation 14
Example 1:
VIN = 5 V, VOUT = 1.2 V, Iomax = 3 A, L = 1.0 H, Cout = 47 µF (MLCC), R1 = 10 k,
R2 = 20 k
(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 7 and Figure 8.
The bandwidth is 117 kHz and the phase margin is 63 degrees.
Figure 7. Module bode plot
fZ
36 2 kHz
=
fP LF
30 Hz
=
GLOOP s

GCO s
 G
DIV s
 G
EA s


=



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