LED2000 datasheet(14/40 Pages) STMICROELECTRONICS

14 / 40 page

Application notes

LED2000

14/40

DocID023432 Rev 4

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

COMP

Gm dV

V+

E/A

AM12897v1

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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