A6986F datasheet(41/72 Pages) STMICROELECTRONICS

Numer części	A6986F

Szczegółowy opis	38 V 1.5 A synchronous step-down switching regulator

PDF	72 Pages

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Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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A6986F

Closing the loop

Laplace transformer of the leading network:

where:

Equation 30

6.4

Total loop gain

In summary, the open loop gain can be expressed as:

Equation 31

Example 1

VIN = 12 V, VOUT = 3.3 V, ROUT = 2.2 

Selecting fSW = 500kHz, L = 6.8 µH, COUT = 20µF and ESR = 1 m, RC= 75 k,

CC= 220 pF, CP = 2.2 pF (please refer to Table 17 on page 56), the gain and phase bode

diagrams are plotted respectively in Figure 32 and Figure 33.

GDIV s



R1 R2

--------------------

1sR1 CR1





R1 R2



R1 R2

--------------------



CR1







-------------------------------------------------------------



 R

CR1



-----------------------------------------



R1 R



R1 R2

-------------------- CR1



-------------------------------------------------------

fZ fp





GDIV s

 G

CO s

 A

0 s





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