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LTC3443 Arkusz danych(PDF) 13 Page - Linear Technology

Numer części LTC3443
Szczegółowy opis  High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter
PDF  16 Pages
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

LTC3443 Arkusz danych(HTML) 13 Page - Linear Technology

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LTC3443
13
sn3443 3443fs
APPLICATIO S I FOR ATIO
The output filter zero is given by:
f
RC
Hz
FILTER ZERO
ESR
OUT
_
••
•
=
π
1
2
where RESR is the capacitor equivalent series resistance.
A troublesome feature in Boost mode is the right-half
plane zero (RHP), and is given by:
f
V
IL V
Hz
RHPZ
IN
OUT
OUT
=
π
2
2• •
• •
The loop gain is typically rolled off before the RHP zero
frequency.
A simple Type I compensation network can be incorpo-
rated to stabilize the loop but at a cost of reduced band-
width and slower transient response. To ensure proper
phase margin, the loop requires to be crossed over a
decade before the LC double pole.
The unity-gain frequency of the error amplifier with the
Type I compensation is given by:
f
RCP
Hz
UG =
π
1
21
1
••
•
Most applications demand an improved transient response
to allow a smaller output filter capacitor. To achieve a
higher bandwidth, Type III compensation is required. Two
zeros are required to compensate for the double-pole
response.
Figure 7. Error Amplifier with Type I Compensation
Figure 8. Error Amplifier with Type III Compensation
1.22V
R1
R2
3443 F07
FB
12
VC
CP1
VOUT
11
–
+
ERROR
AMP
1.22V
R1
R2
3443 F08
FB
12
VC
CP1
CZ1
RZ
VOUT
11
CP2
–
+
ERROR
AMP
f
eR
C
Hz
Which is extremely close to DC
f
RC
Hz
f
RC
Hz
f
RC
Hz
POLE
P
ZERO
ZP
ZERO
Z
POLE
ZP
1
3
1
1
1
2
1
2
2
1
232
1
1
2
1
21
1
2
≈
π
=
π
=
π
=
π
••
•
•
••
•
••
•
••
•



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