ST1S32

Functional description

Doc ID 023246 Rev 1

11/29

Figure 5.

Small signal model for the error amplifier

system stability and can be neglected.

Equation 8

Equation 9

Equation 10

whereas the zero is defined as:

Equation 11

considered as negligible. The error amplifier output resistance is 212 M

singularities are:

Co

Ro

Cc

Cc

Cp

Gm*Vd

Vd

Rc

AM11419v1

G

()

G

EA0

1s

+

R

c

C

c

⋅⋅

()

⋅

s

2

R

0

C

0

C

p

+

() R

c

C

c

sR

0

C

c

⋅

R

0

C

0

C

p

+

() R

c

C

c

⋅

+

⋅

+

() 1

+

⋅

+

⋅⋅

⋅

⋅

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

=

f

P LF

1

2

π R

0

C

c

⋅⋅

⋅

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

=

f

P HF

1

2

π R

c

C

0

C

p

+

()

⋅⋅

⋅

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

=

f

Z

1

2

π R

c

C

c

⋅⋅

⋅

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

=