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参数资料
| 型号： | FAN5340MPX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR SYNC CC 8-MLP |
| 标准包装： | 3,000 |
| 恒定电流： | 是 |
| 拓扑： | PWM，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 ~ 4.8 V |
| 输出电压： | 6.2 V ~ 16 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-MLP（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
Circuit Description
I LED =
Overview
The FAN5340 is an inductive current-mode boost serial LED
driver that achieves LED current regulation by maintaining
0.5V across R SET . The current through the LED string (I LED )
is therefore:
0 . 5
(1)
R SET
While the forward-voltage across the LEDs determines V OUT ,
the FAN5340’s boost regulator output can also support
additional loads on V OUT (see Figure 21) provided its input
current limit is not exceeded.
Over-Voltage 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 FAN5340’s OVP
circuit disables the boost regulator when V OUT exceeds
19.0V and continues to keep the regulator off until V OUT
drops below 18.2V.
Thermal Shutdown
If 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.
Applications
Using VOUT to Drive Additional LED Strings
The VOUT pin can be used as a supply for simple current
sources (shown in Figure 22 using the FAN5640) or discrete
current sinks. To avoid dragging V OUT down when the EN pin
is LOW, the auxiliary strings should not be enabled unless
the EN pin is HIGH. The auxiliary strings can therefore be
PWM dimmed using either the same line as the EN line as
shown below or enabled separately, but within the on-time of
the FAN5340.
IOUT1
1
6
IOUT2
GND
2
FAN5640
5
VIN
Figure 21.
Maximum Output Current
R1
RSET
3
4
EN
vs. Input Voltage
UVLO and Soft-Start
If EN has been LOW for more than 20ms, the IC initiates a “cold
start” soft-start cycle when EN rises, provided V IN is above the
UVLO threshold. The soft-start circuit ramps the voltage
GND
EN
VLED
FB
1
2
3
4
FAN5340
8
7
6
5
VIN
VOUT
SW
PGND
C OUT
C IN
reference to the error amplifier to control inrush current.
PWM Dimming
When EN goes LOW, the IC turns off a MOSFET (Q3 in
Figure 2), which disconnects the LED load, preventing C OUT
from being discharged when EN is LOW. As long as EN is
low for less than 20ms, the regulator’s main regulation loop
quickly regains control when EN returns to a HIGH state.
Short-Circuit Detection
If V OUT falls below V IN – 1.5V, Q3 turns off and remains off
until V OUT recovers to at least V IN – 1.3V.
? 2010 Fairchild Semiconductor Corporation
FAN5340 ? Rev. 1.0.1
9
R2
Figure 22. Driving Additional LED Strings
If using VOUT to drive additional loads, care should be taken
not to exceed the input current limit. This limitation is shown in
Figure 21 for a typical IC. The total load (I OUT 1 + I OUT 2 + I LED )
should always remain below 70% of the value in Figure 21.
www.fairchildsemi.com
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| FAN5340UCX | 功能描述:LED照明驱动器 Sync Constant Crnt Series Boost LEDDrvr 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 |
| FAN5341 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Series Boost LED Driver with Integrated Schottky Diode and Single-Wire Digital Interface |
| FAN53418 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Synchronous DC-DC MOSFET Driver |
| FAN53418 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN53418M | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Synchronous DC-DC MOSFET Driver |
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