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| 型号： | LT3799IMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER TRIAC DIM 16-MSOP |
| 产品培训模块： | LT3799 Offline Isolated Flyback LED Controller |
| 标准包装： | 37 |
| 拓扑： | 交直流离线开关，反激式，PFC |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 通用 |
| 频率： | 25kHz ~ 300kHz |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 配用： | 732-2898-ND - IND TOROID LT3799 NCL30000 750UH |
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LT3800EFE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 4V to 60V 16-Pin TSSOP EP |
| LT3800EFE#PBF | 功能描述:IC REG CTRLR INV PWM CM 16-TSSOP 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 |
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