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参数资料
| 型号： | LTC3785EUF-1#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24 |
| 文件页数： | 6/20页 |
| 文件大小： | 213K |
| 代理商： | LTC3785EUF-1#TRPBF |
LTC3785-1
14
37851fa
CLOSING THE FEEDBACK LOOP
The LTC3785-1 incorporates voltage mode control. The
control to output gain is given by:
GBuck = 1.6 VIN, Buck Mode
GBOOST =
1.6 VOUT
2
VIN
, Boost Mode
The output lter exhibits a double-pole response and is
given by:
fFILTER_POLE=
1
2
π L COUT
where COUT is the output lter capacitor.
The output lter zero is given by:
fFILTER_ ZERO=
1
2
π RESR COUT
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:
fRHPZ =
VIN
2
π IOUT L VOUT
The loop gain is typically rolled off before the RHP zero
frequency.
APPLICATIONS INFORMATION
A simple type I compensation network (Figure 5) can be
incorporated to stabilize the loop but at a cost of reduced
bandwidth and slower transient response. To ensure proper
phase margin, the loop must cross over almost a decade
before the L-C double pole.
The unity gain frequency of the error amplier with the
type 1 compensation is given by:
fUG=
1
2
π R1CP1
Most applications demand an improved transient response
to allow a smaller output lter capacitor. To achieve a higher
bandwidth, type III compensation is required as shown
in Figure 6. Two zeros are required to compensate for the
double pole response.
fPOLE1≈
1
2
π 32e3CP1R1
(a very low frequency)
fZERO1=
1
2
π RZ CP1
fZERO2 =
1
2
π R1CZ1
fPOLE2≈
1
2
π RZ CP2
–
+
FB
ERROR
AMP
1.225V
37851 F05
R1
R2
VC
VOUT
CP1
Figure 5. Error Amplier with Type I Compensation
–
+
FB
ERROR
AMP
1.225V
37851 F06
R1
CZ1
R2
VC
RZ
VOUT
CP1
CP2
Figure 6. Error Amplier with Type III Compensation
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3785EUF-1#PBF | 3 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PQCC24 |
| LTC3823EUH | 4 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PQCC32 |
| LTC3823EGN | 4 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28 |
| LTC3823EUH#TR | 4 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PQCC32 |
| LTC3823EGN#TR | 4 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28 |
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