TPS54260
www.ti.com
SLVSA86 –MARCH 2010
DETAILED DESCRIPTION (continued)
V
O
R1
VSENSE
Vref
Type 2A
Type 2B
Type 1
gm
ea
R
COMP
C2
R3
C1
R3
R2
C2
C
O
O
C1
Figure 47. Types of Frequency Compensation
Aol
P1
A0
Z1
P2
A1
BW
Figure 48. Frequency Response of the Type 2A and Type 2B Frequency Compensation
Aol(V/V)
gmea
Ro =
(18)
(19)
gmea
CO
=
2p ´ BW (Hz)
æ
ç
è
ö
÷
ø
s
1+
2p´ fZ1
EA = A0´
æ
ç
è
ö æ
ö
÷
ø
s
s
1+
´ 1+
÷ ç
2p´ fP1
2p´ fP2
ø è
(20)
(21)
(22)
R2
A0 = gmea ´ Ro ´
R1 + R2
R2
R1 + R2
A1 = gmea ´ Ro| | R3 ´
1
P1=
2p´Ro´ C1
(23)
27
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