AN1330

Closing the loop

13/31

Figure 10.

Error amplifier equivalent circuit and compensation network

Equation 3

Equation 4

where the zero is defined as:

Equation 5

frequency.

4.2

LC filter

The transfer function of the L-C filter is given by:

Equation 6

F

P1

1

2

π

•

R

0

•

C

c

•

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

=

F

P2

1

2

π

•

R

c

•

C

0

C

p

+

()

•

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

=

F

Z1

1

2

π

•

R

c

•

C

c

•

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

=

A

()

R

LOAD

1

ESR

C

OUT

s

•

•

+

()

•

s

2

LC

OUT

ESR

R

LOAD

+

() s

ESR

C

OUT

•

R

LOAD

L

+

•

() R

LOAD

+

•

+

•

•

•

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

=