AST1S31HF datasheet(15/33 Pages) STMICROELECTRONICS

Part #	AST1S31HF

Description	Internal soft-start and enable

PDF	33 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

15 / 33 page

DocID026968 Rev 2

15/33

AST1S31HF

Functional description

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

100

110



110



110



110



110





102

120

Frequency [Hz]

0.1

100

110



110



110



110



110



210



182.5



155



127.5



100



72.5



17.5



Frequency [Hz]

AST1S31HF Datasheet(PDF) 15 Page - STMicroelectronics

AST1S31HF Datasheet(HTML) 15 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Datasheet Download

Link URL