LTC3442 datasheet(13/16 Pages) LINER

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LTC3532

3532fc

The loop gain is typically rolled off before the RHP zero

frequency.

A simple Type I compensation network can be incorpo-

rated to stabilize the loop, but at a cost of reduced band-

width and slower transient response. To ensure proper

phase margin using Type I compensation, the loop must

be crossed over a decade before the LC double pole.

The unity-gain frequency of the error ampliﬁer with the

Type I compensation is given by:

fUG =

2• π •R1• CP1

referring to Figure 7.

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 8, the location of the

poles and zeros are given by:

fPOLE1 ≅

2• π •32e3 •R1• CP1

(which is extremely close to DC)

fZERO1 =

2• π •RZ •CP1

fZERO2 =

2• π •R1• CZ1

fPOLE2 =

2• π •RZ •CP2

where resistance is in ohms and capacitance is in far-

ads.

1.22V

3532 F07

CP1

VOUT

–

ERROR

AMP

1.22V

3532 F08

CP1

CZ1

VOUT

CP2

–

ERROR

AMP

Figure 7. Error Ampliﬁer with Type l Compensation

Figure 8. Error Ampliﬁer with Type lll Compensation

APPLICATIO S I FOR ATIO

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