Datasheet

LTC3428
9
3428fb
APPLICATIONS INFORMATION
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
–
+
1.243V
FB
R1
R2
V
C
V
OUT
R
Z
C
C1
C
C2
3428 F03
5pF
Figure 3.