Closing the loop

AN1723

12/24

Doc ID 9553 Rev 4

Figure 13.

Error amplifier equivalent circuit and compensation network

Equation 7

Equation 8

whereas the zero is defined as:

Equation 9

high frequency.

5.2

LC filter

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

Equation 10

AM11321v1

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

LC

s

()

R

LOAD

1ES R

C

OUT

s

⋅⋅

()

+

()

⋅

s

2

LC

OUT

ESR

R

LOAD

+

() sESR

C

OUT

R

LOAD

L

+

⋅⋅

() R

LOAD

+

⋅

+

⋅⋅

⋅

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

=