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| 型号： | LTC3783IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR PWM CONTROL 16-TSSOP |
| 标准包装： | 95 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | 回扫，PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载，通用 |
| 频率： | 20kHz ~ 1MHz |
| 电源电压： | 3 V ~ 36 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
LTC3783
PWM LED Driver and Boost,
Flyback and SEPIC Controller
True Color PWM TM Delivers Constant Color with
Fully Integrated Load FET Driver for PWM Dimming
100:1 Dimming from Analog Inputs
Wide FB Voltage Range: 0V to 1.23V
Constant Current or Constant Voltage Regulation
Low Shutdown Current: I Q = 20μA
1% 1.23V Internal Voltage Reference
2% RUN Pin Threshold with 100mV Hysteresis
Programmable Operating Frequency
Synchronizable to an External Clock Up to 1.3f OSC
Internal 7V Low Dropout Voltage Regulator
Programmable Output Overvoltage Protection
Programmable Soft-Start
Can be Used in a No R SENSE TM Mode for V DS < 36V
16-Lead DFN and TSSOP Packages
High Voltage LED Arrays
Telecom Power Supplies
42V Automotive Systems
24V Industrial Controls
IP Phone Power Supplies
FEATURES
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3000:1 Dimming Ratio
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Control of High Power LEDs
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(20kHz to 1MHz) with One External Resistor
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APPLICATIONS
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, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM and No R SENSE are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
350mA PWM LED Boost Application
DESCRIPTION
The LTC ? 3783 is a current mode LED driver and boost,
flyback and SEPIC controller that drives both an N-channel
power MOSFET and an N-channel load PWM switch. When
using an external load switch, the PWMIN input not only
drives PWMOUT, but also enables controller GATE switch-
ing and error amplifier operation, allowing the controller
to store load current information while PWMIN is low.
This feature (patent pending) provides extremely fast,
true PWM load switching with no transient overvoltage
or undervoltage issues; LED dimming ratios of 3000:1
can be achieved digitally, avoiding the color shift normally
associated with LED current dimming. The FBP pin allows
analog dimming of load current, further increasing the
effective dimming ratio by 100:1 over PWM alone.
In applications where output load current must be returned
to V IN , optional constant current/constant voltage regula-
tion controls either output (or input) current or output
voltage and provides a limit for the other. I LIM provides a
10:1 analog dimming ratio.
For low- to medium-power applications, No R SENSE mode
can utilize the power MOSFET’s on-resistance to eliminate
the current-sense resistor, thereby maximizing efficiency.
The IC’s operating frequency can be set with an external
resistor over a 20kHz to 1MHz range and can be synchro-
nized to an external clock using the SYNC pin.
The LTC3783 is available in the 16-lead DFN and TSSOP
packages.
Typical Waveforms
V IN
6V TO 16V
(< TOTAL V F OF LEDs)
0.1μF
10μF
105k
1M
LTC3783
RUN V IN
PWMIN OV/FB
I TH PWMOUT
SS I LIM
V REF GATE
FBP SENSE
FBN INTV CC
FREQ GND
10μF
× 2
4.7μF
2.2μH
ZETEX ZLLS1000
237k
LED*
STRING
M1 M2
V OUT
<25V
C OUT
10μF
V PWMIN
5V/DIV
V OUT
0.2V/DIV
AC COUPLED
I L
2.5A/DIV
I LED
0.5A/DIV
10k
6k
SYNC
0.05
12.4k
0.3
M1, M2: SILICONIX Si4470EY
*LUMILEDS LHXL-BW02
GND
3783 TA01a
1μs/DIV
3783 TA01b
3783fb
1
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相关代理商/技术参数 |
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| 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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