LTC3428

9

3428f

Figure 3.

1.243V

FB

R1

R2

3428 F03

5pF

This zero causes a gain increase with phase lag. With

heavy loads, this can occur at a relatively low frequency.

For this reason, loop gain is typically rolled off below the

RHP zero frequency.

A typical error amp compensation is shown in Figure 3 and

in the Typical Application section.

The equations for the loop dynamics are as follow:

f

eC

f

RC

f

RC

pF

POLE

C

ZERO

ZC

ZERO

ZC

1

1

1

1

2

2

1

2

400 6

1

2

1

25

≈

≈

≈

+

••

•

••

•

••

• (

)

π

π

π

APPLICATIO S I FOR ATIO