LTC3538

13

3538fb

R1

1V

FB

RZ

R2

3538 F05

–

+

1

2

Figure 5. Error Amplifier with Type III Compensation

OPERATION

Most applications demand an improved transient response

to allow a smaller output filter capacitor. To achieve a higher

bandwidth, Type III compensation is required, providing

two zeros to compensate for the double-pole response of

the output filter. Referring to Figure 5, the location of the

poles and zeros are given by:

1

2• π • 32e

P1

Hz

(which is extremly close to DC)

1

Hz

1

Hz

1

Hz

where resistance is in Ohms and capacitance is in

Farads.