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参数资料
| 型号： | LTC3538EDCB#TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 2 X 3 MM, PLASTIC, DFN-8 |
| 文件页数： | 4/16页 |
| 文件大小： | 197K |
| 代理商： | LTC3538EDCB#TRM |
LTC3538
12
3538f
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
OUT
LC
Hz
in buck
e
_
(
mod )
=
1
2
π
FILTER POLE
IN
OUT
V
VL C
Hz
in boost
_
(mo
=
2
π
d
d)
e
where L is in Henries and COUT is in Farads.
The output lter zero is given by:
FILTER ZERO
ESR
OUT
RC
Hz
_
=
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:
RHPZ
IN
OUT
V
IL V
Hz
=
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 4, the unity-gain frequency of the error amplier
with the Type I compensation is given by:
UG
P
RC
Hz
=
1
21
1
π
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3538EDCB-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:800mA Synchronous Buck-Boost DC/DC Converter |
| LTC3539 | 制造商:LINER 制造商全称: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 制造商全称: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 |
| LTC3539EDCB#TRMPBF | 功能描述:IC REG BOOST SYNC ADJ 2A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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