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ST1S40 Datasheet(PDF) 12 Page - STMicroelectronics

Part # ST1S40
Description  3 A DC step-down switching regulator
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1S40 Datasheet(HTML) 12 Page - STMicroelectronics

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Functional description
ST1S40
12/29
DocID17928 Rev 5
so by closing the loop, the loop gain GLOOP(s) is:
Equation 13
Example:
VIN = 12 V, VOUT = 1.2 V, Iomax = 3 A, L = 1.5 µH, Cout = 47 µF (MLCC), R1 = 10 k
,
R2 = 20 k
(see Section 6.2 and Section 6.3 for inductor and output capacitor selection
guidelines).
The module and phase Bode plot are reported in Figure 6.
The bandwidth is 100 kHz and the phase margin is 45 degrees.
Figure 6. Module and phase Bode plot
GLOOP s

GCO s
 G
DIV s
 G
EA s


=



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