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參數(shù)資料
| 型號(hào)： | LTC3538EDCB#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 2 X 3 MM, LEAD FREE, PLASTIC, DFN-8 |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大小： | 206K |
| 代理商： | LTC3538EDCB#PBF |
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LTC3538
12
3538fb
Closing the Feedback Loop
The LTC3538 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:
FILTER _POLE =
1
2 π L COUT
Hz
(in buck mode)
FILTER _POLE =
V
IN
2 VOUT π L COUT
Hz
(in boost mode)
where L is in Henries and COUT is in Farads.
The output lter zero is given by:
FILTER _ ZERO =
1
2 π RESR COUT
Hz
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:
RHPZ =
V
IN
2
2 π IOUT L VOUT
Hz
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 4, the unity-gain frequency of the error amplier
with the Type I compensation is given by:
UG =
1
2 π R1CP1
Hz
1V
FB
CP1
VC
R2
3538 F04
–
+
1
2
VOUT
R1
Figure 4. Error Amplier with Type I Compensation
VIA TO GND PLANE
8
VIN
7
SW1
6
SW2
5
VOUT
1
FB
2
VC
3
GND
4
BURST
VOUT
3538 F03
Figure 3. LTC3538 Recommended PCB Layout
OPERATION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3538EDCB | 0.8 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3538EDCB#TR | 0.8 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3541EDD-2 | 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10 |
| LTC3541EDD-2#TR | 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10 |
| LTC3541EDD-3 | 1.25 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO10 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3538EDCB-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:800mA Synchronous Buck-Boost DC/DC Converter |
| LTC3538EDCB-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:800mA Synchronous Buck-Boost DC/DC Converter |
| LTC3539 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up |
| LTC3539-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up |
| LTC3539EDCB#PBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 2A, 1MHz Synchronous Step-Up DC/DC Converter in 2m |
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