Datasheet

A0
A1
P1
Z1
P2
Aol
BW
ea
Aol(V/V)
Ro =
gm
p ´
ea
O
gm
C =
2 BW (Hz)
f
f f
Z1
P1 P2
s
1
2
EA A0
s s
1 1
2 2
æ ö
+
ç ÷
p ´
è ø
= ´
æ ö æ ö
+ ´ +
ç ÷ ç ÷
p ´ p´
è ø è ø
ea
R2
A0 = gm Ro
R1 + R2
´ ´
ea
R2
A1 = gm Ro| | R3
R1 + R2
´ ´
1
P1
2 Ro C1
=
p ´ ´
1
Z1
2 R3 C1
=
p ´ ´
p ´ ´
O O
1
P2 = type 2a
2 R3 | | R (C2 + C )
p ´ ´
O O
1
P2 = type 2b
2 R3 | | R C
p ´ ´
O O
1
P2 = type 1
2 R (C2 + C )
TPS54260
www.ti.com SLVSA86A –MARCH 2010–REVISED DECEMBER 2010
DETAILED DESCRIPTION (continued)
Figure 48. Frequency Response of the Type 2A and Type 2B Frequency Compensation
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