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参数资料
| 型号： | FAN5341UMPX |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 显示驱动器 |
| 中文描述： | LED DISPLAY DRIVER, PDSO6 |
| 封装： | 2 X 2 MM, 0.55 MM HEIGHT, GREEN, MO-229, UMLP-6 |
| 文件页数： | 10/11页 |
| 文件大小： | 673K |
| 代理商： | FAN5341UMPX |
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5341 Rev. 1.0.1
8
FA
N
5
341
—
Seri
es
B
oost
LED
D
river
wit
h
Int
e
grat
ed
Schottky
Diode
and
Singl
e-
W
ire
Digit
a
lInt
e
rf
ace
Circuit Description
Overview
The FAN5341 is an inductive current-mode boost serial
LED driver that achieves LED current regulation by
maintaining 0.253V across the RSET resistor. The current
through the LED string (ILED) is therefore given by:
SET
LED
R
I
253
.
0
=
(1)
The voltage VOUT is determined by the sum of the forward
voltages across each LED, plus the voltage across RSET,
which is always 253mV.
Driving Five LEDs in Series
FAN5341 can drive five LEDs in series but, the forward
voltage (VF) of the LED MUST be less than 3.5V such that it
remains under the over-voltage specification of 18.9V.
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 VIN is
above the UVLO threshold.
Digital Interface
The FAN5341 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
FAN5341 does not require the system processor to
constantly supply a signal to it to drive the LEDs.
Digital Dimming Control
The FAN5341 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 14 shows the digital pulse dimming control.
Over-Current and Short-Circuit Detection
The boost regulator employs a cycle-by-cycle peak inductor
current limit of ~750mA.
Over-Voltage / Open-Circuit Protection
If the LED string is an open circuit, FB remains at 0V and
the output voltag continues to increase in the absence of an
over-voltage protection (OVP) circuit. The FAN5341’s OVP
circuit disables the boost regulator when VOUT exceeds
18.9V and continues to keep the regulator off until VOUT
drops below 18.1V.
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN5343 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:6-LED Series Boost LED Driver with Integrated Schottky Diode and Single-Wire Digital Interface |
| FAN5343UMPX | 功能描述:LED照明驱动器 6-LED BOOST LED DRVR 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 |
| 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 |
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