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LTC3428_15 Datasheet, PDF (9/12 Pages) Linear Technology – 4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm 3mm DFN | |||
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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:
fPOLE1
â
2â¢
Ï
1
⢠400e6 ⢠CC1
fZERO1
â
2â¢
Ï
1
⢠RZ
⢠CC1
fZERO2
â
2â¢
Ï
⢠RZ
1
⢠(CC2
+
5pF)
LTC3428
1.243V
FB
VC
VOUT
R1
R2
5pF
RZ
CC2
CC1
3428 F03
Figure 3.
3428fb
9
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