收藏本站
LT3799
BLOCK DIAGRAM
R4
C1
?
L1C
D2
C3
R3
R1
C2
V IN
L1A
T1
D1
L1B
V OUT +
C7
R5
9
FB
R10
10
DCM
16
V IN_SENSE
11
V IN
R2
N:1
V OUT –
+ – A5
+
+
+ –
–
+
S
R
CURRENT
C4
C6
6
5
7
8
1
2
3
CT FAULT
DETECTION
FAULT
COMP +
COMP –
CTRL1
CTRL2
CTRL3
1M
S&H
A3
–
+
A2
600mV
SW1
A6
1.22V +
A8
ONE
SHOT
CURRENT
COMPARATOR
–
A1
A7
Q
S
MASTER
LATCH
LOW OUTPUT
MULTIPLIER
OSCILLATOR
A4
R7
R8
DRIVER
INTV CC
GATE
SENSE
GND
13
14
15
17
C5
M1
R6
4 V REF
3799 BD
OPERATION
The LT3799 is a current mode switching controller IC
designed specifically for generating an average current
output in an isolated flyback topology. The special problem
normally encountered in such circuits is that information
relating to the output voltage and current on the isolated
secondary side of the transformer must be communicated
to the primary side in order to maintain regulation. Histori-
cally, this has been done with an opto-isolator. The LT3799
uses a novel method of using the external MOSFETs peak
current information from the sense resistor to calculate
the output current of a flyback converter without the need
of an opto-coupler. In addition, it also detects open LED
conditions by examining the third winding voltage when
the main power switch is off.
Power factor has become an important specification for
lighting. A power factor of one is achieved if the current
drawn is proportional to the input voltage. The LT3799
modulates the peak current limit with a scaled version of
the input voltage. This technique provides power factors
of 0.97 or greater.
The Block Diagram shows an overall view of the system.
The external components are in a flyback topology con-
figuration. The third winding senses the output voltage
and also supplies power to the part in steady-state opera-
tion. The V IN pin supplies power to an internal LDO that
generates 10V at the INTV CC pin. The novel control circuitry
consists of an error amplifier, a multiplier, a transmission
3799fa
8
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
LT3956EUHE#PBF IC LED DVR BUCK BOOST 36-VQFN
LTC3201EMS#TRPBF IC LED DRVR WHITE BCKLGT 10-MSOP
LTC3202EDD#PBF IC LED DRIVR WHITE BCKLGT 10-DFN
LTC3205EUF#TRPBF IC LED DRVR WT/RGB BCKLGT 24-QFN
LTC3206EUF#TRPBF IC LED DRVR WT/RGB BCKLGT 24-QFN
LTC3207EUF-1#TRPBF IC LED DRIVR QVGA DISPLAY 24-QFN
LTC3208EUH#TRPBF IC LED DRIVR QVGA DISPLAY 32-QFN
LTC3209EUF-2#TRPBF IC LED DRIVR QVGA DISPLAY 20-QFN
相关代理商/技术参数
LT3799IMSE#PBF 制造商:Linear Technology 功能描述:IC LED DRVR MSOP-16 制造商:Linear Technology 功能描述:IC, LED DRVR, MSOP-16
LT3799IMSE#TRPBF 功能描述:IC LED DRIVER TRIAC DIM 16-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LT3799IMSE-1#PBF 功能描述:IC LED CTLR ISO ACT PFC 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LT3799IMSE-1#TRPBF 功能描述:IC LED CTLR ISO ACT PFC 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LT3799IMSEPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:Offline Isolated Flyback LED Controller with Active PFC
LT38 制造商:Thomas & Betts 功能描述:3/8 BLACK STRAIGHT LIQUIDTIGHT FTG
LT-380 制造商:Citizen Systems America Corporation 功能描述:Thermal mech/80mm/24Volts/8dots,mm/2.5in.sec
LT3800 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller