Application information

PM8908

22/28

DocID027688 Rev 3

6.7

Compensation network

The PM8908 device implements a constant on-time control loop. The compensation

network is shown in Figure 10.

Figure 10. Compensation network

The following procedure shall be followed in order to calculate the best network external

components value.



according to Equation 10:

Equation 10

where:

–

frequency

–



Equation 11



Equation 12



Check the phase margin obtained and repeat the whole procedure if necessary.

COMP

REFIN

8

9

REF

7

















































OUT

T

OUT

T

M

CS

OUT

T

F

C

ESR

f

C

ESR

f

g

R

C

f

R

5

2

1

5

2

1

2







F

T

F

R

f

C







5

2

1





























OUT

T

C

OUT

P

C

ESR

f

R

C

ESR

C

5

2

1

