ST1S40 datasheet(12/29 Pages) STMICROELECTRONICS

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ST1S40 数据表(PDF) 12 Page - STMicroelectronics

部件名	ST1S40

功能描述	3 A DC step-down switching regulator

PDF	29 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

12 / 29 page

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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