參數(shù)資料
型號(hào)： LTC3442
廠商： Linear Integrated Systems
英文描述： Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation
中文描述： 微功率同步降壓升壓與自動(dòng)突發(fā)模式的DC / DC轉(zhuǎn)換器操作
文件頁(yè)數(shù)： 15/20頁(yè)
文件大?。?/td> 332K
代理商： LTC3442
LTC3442
15
3442f
1.22V
R1
R2
3442 F07
FB
12
V
C
11
C
P1
V
OUT
–
+
ERROR
AMP
where f = switching frequency in MHz. Therefore fre-
quency selection is a compromise between the optimal
efficiency and the smallest solution size.
Closing the Feedback Loop
The LTC3442 incorporates voltage mode PWM control.
The control to output gain varies with operation region
(buck, boost, buck/boost), but is usually no greater than
15. The output filter exhibits a double pole response, as
given by:
f
L C
FILTER POLE
OUT
=
1
2
π
Hz
(in buck mode)
f
V
V
L C
FILTER POLE
IN
OUT
OUT
=
2
π
Hz
(in boost mode)
where L is in henries and C
OUT
is in farads.
The output filter zero is given by:
f
R
C
FILTER ZERO
ESR
OUT
=
1
2
π
Hz
where R
ESR
is the equivalent series resistance of the
output cap.
A troublesome feature in boost mode is the right-half
plane zero (RHP), given by:
f
V
I
L V
RHPZ
IN
OUT
OUT
=
2
2
π
Hz
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
bandwidth and slower transient response. To ensure
proper phase margin using Type I compensation, the loop
must 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
R
C
Hz
UG
P
=
1
2
1
1
π
referring to Figure 7.
Most applications demand an improved transient response
to allow a smaller output filter capacitor. To achieve a
higher bandwidth, Type III compensation is required,
providing two zeros to compensate for the double-pole
response of the output filter. Referring to Figure 8, the
location of the poles and zeros are given by:
f
e
R
CP
Hz
1
which isextremelyclose toDC
1
2
1
2
1
2
π
f
R
C
Hz
f
R
C
Hz
f
R
C
Hz
POLE
ZERO
Z
P
ZERO
Z
POLE
Z
P
1
3
1
1
2
1
2
2
1
2
32
1
1
=
=
=
(
)
π
π
π
where resistance is in ohms and capacitance is in farads.
Figure 7. Error Amplifier with Type I Compensation
APPLICATIOU
W
U
U
Figure 8. Error Amplifier with Type III Compensation
1.22V
R1
R2
3442 F08
FB
12
V
C
11
C
P1
C
Z1
R
Z
V
OUT
C
P2
–
+
ERROR
AMP
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