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参数资料
| 型号： | LTC3785EUF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, PLASTIC, MO-220WGGD, QFN-24 |
| 文件页数： | 6/20页 |
| 文件大小： | 275K |
| 代理商： | LTC3785EUF |
LTC3785
3785fc
applicaTions inForMaTion
CLOSING THE FEEDBACK LOOP
The LTC3785 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 filter exhibits a double-pole response and is
given by:
fFILTER_POLE =
1
2
π L COUT
where COUT is the output filter capacitor.
The output filter zero is given by:
fFILTER_ZERO=
1
2
π RESR COUT
whereRESRisthecapacitorequivalentseriesresistance.
A troublesome feature in boost mode is the right half plane
zero (RHP), and is given by:
fRHPZ =
VIN
2
2
π IOUT L VOUT
The loop gain is typically rolled off before the RHP zero
frequency.
A simple Type I compensation network (Figure 5) can be
incorporated to stabilize the loop but at a cost of reduced
bandwidthandslowertransientresponse.Toensureproper
phase margin, the loop must cross over almost a decade
before the L-C double pole.
The unity gain frequency of the error amplifier with the
Type I compensation is given by:
fUG =
1
2
π R1CP1
Mostapplicationsdemandanimprovedtransientresponse
toallowasmalleroutputfiltercapacitor.Toachieveahigher
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
Figure 5. Error Amplifier with Type I Compensation
–
+
FB
ERROR
AMP
1.225V
3785 F05
R1
R2
VC
VOUT
CP1
Figure 6. Error Amplifier with Type III Compensation
–
+
FB
ERROR
AMP
1.225V
3785 F06
R1
CZ1
R2
VC
RZ
VOUT
CP1
CP2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3785EUF#PBF | 功能描述:IC REG CTRLR BST PWM VM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3785EUF#TRPBF | 功能描述:IC REG CTRLR BST PWM VM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3785EUF-1#PBF | 功能描述:IC REG CTRLR BST PWM VM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3785EUF-1#TRPBF | 功能描述:IC REG CTRLR BST PWM VM 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3785EUFPBF | 制造商:Linear Technology 功能描述:10V Synch Buck-Boost Controller LTC3785 |
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