ST1CC40 datasheet(12/37 Pages) STMICROELECTRONICS

Part #	ST1CC40

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

PDF	37 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

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







ST1CC40 Datasheet(PDF) 12 Page - STMicroelectronics

ST1CC40 Datasheet(HTML) 12 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

Datasheet Download

Link URL