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参数资料
| 型号： | FAN5345S30X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR ASYNC BOOST 30V 6SSOT |
| 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 |
| 类型 - 次要： | 白色 LED |
| 频率： | 950kHz ~ 1.35MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 6.2 V ~ 28.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | 6-SSOT |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | FAN5345S30XDKR |
Circuit Description
I LED ?
Overview
The FAN5345 is an inductive current-mode boost serial LED
driver that achieves LED current regulation by maintaining
0.250V across the R SET resistor. The current through the LED
string (I LED ) is therefore given by:
0 . 250
(1)
R SET
The voltage V OUT is determined by 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.
Driving Eight LEDs in Series
FAN5345S30X can drive 8 LEDs in series, but the minimum
input voltage (V IN ) must be greater than or equal to 2.9V
while the forward voltage of the white LED should be less
than or equal to 3.2V and the maximum LED current cannot
exceed 20mA in order to maintain stable operation.
Digital Interface
The FAN5345 implements a single-wire digital interface to
Digital Dimming Control
The FAN5345 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 number of positive edges applied to the EN pin.
Figure 28. Digital Pulse-Dimming Control Diagram shows the
digital pulse dimming control. The dimming control function
has no effect before soft-start finishes. The soft-start takes
about 2ms.
Over-Current and Short-Circuit Detection
The boost regulator employs a cycle-by-cycle peak inductor
current limit of 300mA (typical) and 750mA (typical) for
FAN5345S20X and FAN5345S30X respectively.
Over-Voltage / Open-Circuit Protection
If the LED string is an open circuit, FB remains at 0V and the
output voltage continues to increase in the absence of an
over-voltage protection (OVP) circuit. The FAN5345S20X
OVP circuit disables the boost regulator when V OUT exceeds
20.0V and continues to keep the regulator off until V OUT drops
below 19.0V. For FAN5345S30X, the OVP is 30.0V and it
turns back on when V OUT is below 29.0V.
Thermal Shutdown
When the die temperature exceeds 150°C, a reset occurs and
remains in effect until the die cools to 115°C; at which time,
the circuit is allowed to begin the soft-start sequence.
program the LED brightness to one of thirty-two (32) levels
spaced in linear steps. With this single-wire solution, the
FAN5345 does not require the system processor to constantly
supply a signal to drive the LEDs.
Figure 28. Digital Pulse-Dimming Control Diagram
? 2011 Fairchild Semiconductor Corporation
FAN5345 ? Rev. 1.0.0
10
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| FAN5346S30X | 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 |
| FAN5350 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:3MHz, 600mA Step-Down DC-DC Converter in Chip-Scale and MLP Packaging |
| FAN5350_08 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:3MHz, 600mA Step-Down DC-DC Converter in Chip-Scale and MLP Packaging |
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