ST1CC40DR datasheet(12/37 Pages) STMICROELECTRONICS

부품명	ST1CC40DR

상세설명	3 A monolithic step-down current source with synchronous rectification

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제조업체	STMICROELECTRONICS [STMicroelectronics]

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12 / 37 page

Application notes

ST1CC40

12/37

DocID18279 Rev 5

Application notes

6.1

Closing the loop

Figure 5. Block diagram of the loop

6.2

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 1

where R0 represents the load resistance, Ri the equivalent sensing resistor of the current

sense circuitry,

p the single pole introduced by the LC filter and z the zero given by the

ESR of the output capacitor.

FH(s) accounts for 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



-------

R0 TSW



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

mC 1D

–

 0,5

–







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



------







------





---------------------- FH s







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