R6986 datasheet(38/62 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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38 / 62 page

Closing the loop

R6986

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DocID026996 Rev 2

Equation 26

whereas the zero is defined as:

Equation 27

6.3

Voltage divider

The contribution of a simple voltage divider is:

Equation 28

A small signal capacitor in parallel to the upper resistor (see Figure 26) of the voltage divider

implements a leading network (fzero < fpole), sometimes necessary to improve the system

phase margin:

Figure 26. Leading network example

Laplace transformer of the leading network:

Equation 29

fPHF

 R

C0 Cp





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

 R



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

GDIV s



R1 R2

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

GDIV s



R1 R2

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

1sR1 CR1





R1 R2



R1 R2

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



CR1







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



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