R6986 datasheet(36/62 Pages) STMICROELECTRONICS

Il numero della parte	R6986

Spiegazioni elettronici	38 V, 2 A synchronous step-down switching regulator

PDF	62 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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36 / 62 page

Closing the loop

R6986

36/62

DocID026996 Rev 2

Equation 19

Equation 20

where:

Equation 21

Sn represents the on time slope of the sensed inductor current, Se the on time slope of the

external ramp (VPP peak-to-peak amplitude) that implements the slope compensation to

avoid sub-harmonic oscillations at duty cycle over 50%.

Se can be calculated from the parameter VPP gCS given in Table 5 on page 8.

The sampling effect contribution FH(s) is:

Equation 22

where:

Equation 23



ESR COUT



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



RLOAD COUT



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

mc 1D

–





0.5

–

LCOUT fSW



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

------

VPP gCS fSW



VIN VOUT

–

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







FH s







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



---------

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



mc 1D

–

 0.5

–







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

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