TPS54360
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SLVSBB4C –AUGUST 2012–REVISED OCTOBER 2012
DETAILED DESCRIPTION (continued)
Aol
A0
P1
Z1
P2
A1
BW
Figure 32. Frequency Response of the Type 2A and Type 2B Frequency Compensation
Aol(V/V)
gmea
Ro =
(13)
(14)
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
(15)
(16)
(17)
R2
A0 = gmea ´ Ro ´
R1 + R2
R2
R1 + R2
A1 = gmea ´ Ro| | R3 ´
1
P1=
2p´Ro´ C1
(18)
1
Z1=
2p´R3´ C1
(19)
(20)
1
P2 =
type 2a
2p ´ R3 | | RO ´ (C2 + CO )
1
P2 =
type 2b
2p ´ R3 | | RO ´ CO
(21)
(22)
1
P2 =
type 1
2p ´ RO ´ (C2 + CO
)
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