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参数资料
| 型号： | FAN5343UMPX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 6LED 500MW 6UMLP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 频率： | 1MHz ~ 1.4MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 6.2 V ~ 24 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-UMLP |
| 供应商设备封装： | 6-UMLP（3x3） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | FAN5343UMPXDKR |
Functional Description
I LED =
R SET
Overview
The FAN5343 is an inductive current-mode boost serial
LED driver that achieves LED current regulation by
maintaining 0.25V across the R SET resistor. The current
through the LED string (I LED ) is therefore given by:
0 . 25
(1)
The voltage V OUT is determined by the the sum of the
forward voltages across each LED, plus the voltage
across R SET , which is always 250mV.
UVLO and Soft-Start
If EN has been LOW for more than 1ms, the IC may
initiate a “cold start” soft-start cycle when EN rises,
provided V IN is above the UVLO threshold.
Digital Interface
The FAN5343 implements a single-wire digital interface to
program the LED brightness to one of thirty two (32) levels
spaced in linear steps. With this single-wire solution, the
FAN5343 does not require the system processor to
constantly supply a signal to drive the LEDs.
Digital Dimming Control
The FAN5343 starts driving the LEDs at the maximum
brightness level. After startup, the control logic is ready to
accept programming pulses to decrease the brightness level
by the positive edges applied to the EN pin. Figure 14
illustrates the digital pulse dimming control for the FAN5343.
Over-Current and Short-Circuit Detection
The boost regulator employs a cycle-by-cycle peak inductor
current limit of ~750mA to protect the switching elements and
the device itself from being damaged.
Over-Voltage / Open-Circuit Protection
If the LED string is open circuit, FB remains at 0V and the
output voltage continues to increase in the absence of an
Over-Voltage Protection (OVP) circuit. The FAN5343’s OVP
circuit disables the boost regulator when V OUT exceeds 24.5V
and keeps the regulator off until V OUT drops below 22.5V.
Thermal Shutdown
When the die temperature exceeds 150°C, a reset occurs and
remains in effect until the die cools to 125°C; at which time, the
circuit is allowed to begin the soft-start sequence.
Figure 14. Digital Pulse-Dimming Control Diagram
? 2009 Fairchild Semiconductor Corporation
FAN5343 ? Rev. 1.0.4
8
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN5345 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Series Boost LED Driver with Single-Wire Digital Interface |
| FAN5345S20X | 功能描述:LED照明驱动器 Async Series Driver SingleWire Dig Intfc RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| FAN5345S30X | 功能描述:LED照明驱动器 Async Series Driver SingleWire Dig Intfc RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| FAN5346 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Series Boost LED Driver with PWM Dimming Interface |
| FAN5346S20X | 功能描述:LED照明驱动器 Async Series Driver ANLG PWM DIM Intfc RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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