ST1CC40DR datasheet(14/37 Pages) STMICROELECTRONICS

Il numero della parte	ST1CC40DR

Spiegazioni elettronici	3 A monolithic step-down current source with synchronous rectification

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14 / 37 page

Application notes

ST1CC40

14/37

DocID18279 Rev 5

Figure 6. Transconductance embedded error amplifier

RC and CC introduce a pole and a zero in the open loop gain. CP does not significantly affect

system stability but it is useful to reduce the noise at the output of the error amplifier.

The transfer function of the error amplifier and its compensation network is:

Equation 8

where Avo = Gm · Ro.

The poles of this transfer function are (if Cc >> C0 + CP):

Equation 9

Equation 10

whereas the zero is defined as:

Equation 11

A0 s



AV0 1s

Rc Cc







2 R

C0 Cp

 R

c Cc

sR0 Cc



R0 C0 Cp

 R

c Cc



 1







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

fP LF

 R

0 Cc





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

fP HF

 R

C0 Cp







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

 R

c Cc





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

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