R6986 datasheet(35/62 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]

Homepage	http://www.st.com

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R6986

Closing the loop

Figure 24. Block diagram of the loop

6.1

GCO(s) control to output transfer function

The accurate control to output transfer function for a buck peak current mode converter can

be written as:

Equation 18

where RLOAD represents the load resistance, Ri the equivalent sensing resistor of the

current sense circuitry,



p the single pole introduced by the the power stage and z the zero

given by the ESR of the output capacitor.

FH(s) accounts the sampling effect performed by the PWM comparator on the output of the

error amplifier that introduces a double pole at one half of the switching frequency.

GCO s



RLOAD

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

RLOAD TSW



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

mC 1D

–





0.5

–





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



------







------





---------------------- FH







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