( )

(

)

(

)

(

)

(

)

(

)

2

1

1

3

3

2

1

2

1

1

2

3

3

1

2

sR C

1

s R

R

C

1

G s

R C C

sR

C

C

s

1

sR C

1

C

C

+

´

+

+

=

æ

ö

æ

ö

+

´

+

´

+

ç

÷

ç

÷

ç

÷

+

è

ø

è

ø

(21)

Z1

2

1

1

f

2

R

C

=

p ´

´

(22)

(

)

(

)

P1

1

2

2

1

2

1

f

C

C

2

R

C

C

=

æ

ö

´

p ´

´ ç

÷

ç

÷

+

è

ø

(23)

P2

3

3

1

f

2

R

C

=

p ´

´

(24)

(

)

Z2

1

3

3

1

f

2

R

R

C

=

p ´

+

´

(25)

(

)

C

1

1

2

1

f

2

R

C

C

=

p ´

´

+

(26)

1

BIAS

OUT

0.8

R

R

V

0.8

´

=

-

(27)

TPS51113, TPS51163

compromise between high phase margin and fast response. A phase margin of over 60° is usually

recommended. Then, the compensator gain is chosen to achieve the desired bandwidth.

Copyright © 2009, Texas Instruments Incorporated

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