FP5101 / FP5101A

This datasheet contains new product information.

Feeling Technology reserves the rights to modify the product specification without notice.

No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.

Rev. 0.64

15/20

)

R

R

(

C

2

1

F

3

1

3

2

Z







3

3

2

P

C

R

2

1

F





Use the following steps to locate the poles and zeros of the compensation network.

Select the desired zero crossover frequency

ESR

S

O

F

F

)

10

/

1

~

5

/

1

(

:

F





1

LC

O

IN

OSC

2

R

F

F

V

V

R









2. P

lace the first zero below the filter’s double pole (~75% F

LC

1

Z

F

75

.

0

F





75

.

0

F

R

2

1

C

LC

2

2











3. Place the first pole at the ESR zero.

ESR

1

P

F

F



1

F

C

R

2

C

C

ESR

2

2

2

1













4. Place the second zero at filter’s double pole.

5. Place the second pole at half the switching frequency.

S

2

P

F

5

.

0

F





LC

2

Z

F

F



Combine above two equations will get the following component equations

1

F

2

F

R

R

LC

S

1

3







S

3

3

F

R

1

C









6. Check the gain against the error amplifier’s open loop gain.

7. Estimate phase margin. Repeat if necessary.