LTC3428 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC3428 Datasheet PDF : 12 Pages
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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
≈
2•
π
1
• 400e6 • CC1
fZERO1
≈
2•
π
1
• RZ
• CC1
fZERO2
≈
2•
π
• 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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