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| 型号： | LTC3530EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 10DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 300kHz ~ 2MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
LTC3530
APPLICATIONS INFORMATION
where f = switching frequency in MHz. Therefore frequency
selection is a compromise between the optimal ef?ciency
and the smallest solution size.
Closing the Feedback Loop
The LTC3530 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
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. The
unity-gain frequency of the error ampli?er with the Type
I compensation is given by:
f UG =
given by:
f FILTER — POLE =
(in buck mode)
1
2 ? ? L ? C OUT
Hz
1
Hz (referring to Figure 4).
2 ? ? R1? C P1
Most applications demand an improved transient response
to allow a smaller output ?lter capacitor. To achieve a higher
f FILTER — POLE =
V IN
2 ? V OUT ? ? L ? C OUT
Hz
bandwidth, Type III compensation is required, providing
two zeros to compensate for the double-pole response of
the output ?lter. Referring to Figure 5, the location of the
poles and zeros are given by:
(in boost mode)
where L is in henries and C OUT is in farads.
f POLE1
1
Hz
2 ? ? 32,000 ? R1? CP1
The output ?lter zero is given by:
(which is extremely close to DC)
f FILTER — ZERO =
1
Hz
2 ? ? R ESR ? C OUT
where R ESR 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 ZERO1 =
f ZERO2 =
f POLE2 =
1
Hz
2 ? ? R Z ? C P1
1
Hz
2 ? ? R1? C Z1
1
Hz
2 ? ? R Z ? C P2
f RHPZ =
V IN2
2 ? ?I OUT ? L ? V OUT
Hz
where resistance is in ohms and capacitance is in
farads.
V OUT
+
ERROR
AMP
–
1.215V
FB
12
V OUT
R1
+
ERROR
AMP
–
1.215V
FB
12
V C
11
R Z
C P1
R1
R2
C Z1
V C
11
C P1
R2
3530 F03
C P2
3530 F04
Figure 4. Error Ampli?er with Type I Compensation
Figure 5. Error Ampli?er with Type III Compensation
3530fb
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3530EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
| LTC3530EMS | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
| LTC3530EMS#PBF | 功能描述:IC REG BUCK BST SYNC 0.6A 10MSOP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3530EMS#TRPBF | 功能描述:IC REG BUCK BST SYNC 0.6A 10MSOP 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 |
| LTC3530EMS-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide Input Voltage Synchronous Buck-Boost DC/DC Converter |
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