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參數(shù)資料
| 型號： | LTC3533EDE#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 7 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | 4 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WGED-3, DFN-14 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 313K |
| 代理商： | LTC3533EDE#TR |
LTC3533
13
3533f
APPLICATIONS INFORMATION
Closing the Feedback Loop
The LTC3533 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 lter exhibits a double pole response, as
given by:
f
LC
Hz
in buck
e
f
FILTER POLE
OUT
F
_
(
mod )
=
1
2
π
IILTER POLE
IN
OUT
V
VL C
Hz
in boost
_
(
=
2
π
m
mod )
e
where L is in Henries and COUT is in Farads.
The output lter zero is given by:
f
RC
Hz
FILTER ZERO
ESR
OUT
_
=
1
2
π
where RESR is the equivalent series resistance of the
output capacitor.
A troublesome feature in boost mode is the right-half plane
zero (RHP), given by:
f
V
IL V
Hz
RHPZ
IN
OUT
=
2
π
The loop gain is typically rolled off before the RHP zero
frequency.
A simple Type I compensation network can be incorporated
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. Referring
to Figure 5, the unity-gain frequency of the error amplier
with the Type I compensation is given by:
f
RC
Hz
UG
P
=
1
21
1
π
Most applications demand an improved transient response
to allow a smaller output lter capacitor. To achieve a higher
bandwidth, Type III compensation is required, providing
two zeros to compensate for the double-pole response of
the output lter. Referring to Figure 6, the location of the
poles and zeros are given by:
f
eR C
Hz
which is a
POLE
P
1
3
1
210
1
(
=
π
very llow frequency)
f
RC
Hz
f
ZERO
ZP
ZERO
1
2
1
2
=
π
==
=
1
21
1
2
1
2
π
RC
Hz
f
RC
Hz
Z
POLE
ZP
where resistance is in Ohms and capacitance is in Farads.
1.22V
R1
R2
3533 F05
FB
12
VC
CP1
VOUT
11
–
+
ERROR
AMP
1.22V
R1
R2
3533 F06
FB
12
VC
CP1
CZ1
RZ
VOUT
11
CP2
–
+
ERROR
AMP
Figure 5. Error Amplier with Type I Compensation
Figure 6. Error Amplier with Type III Compensation
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| LTC3533EDE | 7 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO14 |
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