TPS54140A Datasheet, PDF (28/51 Pages) Texas Instruments – 1.5-A, 42 V Step Down SWIFT™ DC/DC Converter with Eco-mode™

TPS54140A
SLVSB55A – MAY 2012 – REVISED JULY 2012
Ro = ^Aol(V/V)
gm_ea
C_OUT =
2p
gm_ea
´ BW (Hz)
DETAILED DESCRIPTION (continued)
EA = A0 ´
æ
ç¹
+
è
2p
s
´ f_Z1
ö
÷
ø
æ
ç¹⁺
è
s
2p ´
f_P1
ö
÷´
ø
æ
ç¹⁺
è
2p
s
´ f_P2
ö
÷
ø
A0 = gm_ea
´ Ro ´
R2
R1 + R2
A1 = gm_ea
´ Ro| | R3 ´
R2
R1 + R2
1
P1 =
2p ´ Ro ´ C1
1
Z1 =
2p ´ R3 ´ C1
P2 =
1
type 2a
2p ´ R3 | | R ´ (C2 + C_OUT )
P2 =
1
type 2b
2p ´ R3 | | R ´ C_OUT
P2 =
1
type 1
2p ´ R ´ (C2 + C_OUT )
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