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| 型号： | FAN5333ASX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT SOT23-5 |
| 产品变化通告： | Mold Compound Change 12/Dec/2007 |
| 标准包装： | 1 |
| 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： | 1.5MHz |
| 电源电压： | 1.8 V ~ 5.5 V |
| 输出电压： | 30V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | FAN5333ASXDKR |
R MIN
R MIN R SET
Inductor Selection
The inductor parameters directly related to device performances
are saturation current and dc resistance. The FAN5333A/
FAN5333B operates with a typical inductor value of 10μH. The
lower the dc resistance, the higher the ef?ciency. Usually a
trade-off between inductor size, cost and overall ef?ciency is
needed to make the optimum choice.
The inductor saturation current should be rated around 1A, in
an application having the LED current near the maximum cur-
rent as indicated in “Typical Performance Characteristics”. The
peak inductor current is limited to 1.5A by the current sense
loop. This limit is reached only during the start-up and with
heavy load condition; when this event occurs the converter can
shift over in discontinuous conduction mode due to the auto-
matic turn-off of the switching transistor, resulting in higher rip-
ple and reduced ef?ciency.
Some recommended inductors are suggested in the table
below:
Brightness Control
1. Dimming Using PWM Logic Signal
A PWM signal applied to SHDN Table 5 on page 8 can control
the LED’s brightness in direct dependence with the duty cycle.
The maximum frequency should not exceed 1kHz to ensure a
linear dependence of the LED’s average current. The amplitude
of the PWM signal should be suitable to turn the FAN5333 ON
and OFF.
Alternatively, a PWM logic signal can be used to switch a FET
ON/OFF to change the resistance that sets the LED’s current
Table 6 on page 8. Adjusting the duty cycle from 0% to 100%
results in varying the LED’s current between I MIN and I MAX .
Where
V FB V FB
I MIN = ------------- and I MAX = --------------------------------
Inductor
Com-
Value
10μH
Vendor
TDK
Part Number
SLF6025&-100M1R0
ment
FAN5333
10μH
MURATA
LQH66SN100M01C
Highest
SHDN
Ef?ciency
10μH
COOPER
SD414-100
Small
Size
Table 1: Recommended Inductors
Capacitors Selection
For best performance, low ESR input and output capacitors are
required. Ceramic capacitors of C IN = 10μF and C OUT = 1μF
placed as close to the IC pins, are required for the maximum
load(65mA). For the lighter load ( ≤ 20mA ) the capacitances may
be reduced to C IN = 4.7μF and C OUT = 0.47μF or even to 0.1μF,
if higher ripple is acceptable. The output capacitor voltage rating
should be according to the V OUT setting. Some capacitors are
suggested in the table below.
Figure 5. Dimming Using a PWM Signal
FAN5333
FB
R SET
R MIN
Figure 6. Dimming Using a PWM Logic Signal
Capacitor
Value
0.47μF
1μF
Vendor
Panasonic
Murata
Part Number
ECJ-3YB1E474K
GRM21BR61E105K
2. Dimming Using DC Voltage
An external adjustable DC voltage Table 7 on page 8 between
0V to 2V can control the LED’s current from 15mA to 0mA,
respectively.
10μF
Murata
GRM21BR61A106K
FAN5333A
FAN5333B
Table 2: Recommended Capacitors
FB
V DC
FB
V DC
Diode Selection
5 ?
1.6K ?
90K ?
15 ?
4.7K ?
90K ?
The external diode used for recti?cation is usually a Schottky
diode. Its average forward current and reverse voltage maxi-
mum ratings should exceed the load current and the voltage at
the output of the converter respectively. A barrier Schottky diode
such as BAT54 is preferred, due to its lower reverse current over
the temperature range.
Care should be taken to avoid any short circuit of V OUT to GND,
even with the IC disabled, since the diode can be instantly dam-
aged by the excessive current.
FAN5333A/FAN5333B Rev. 1.0.1
8
Figure 7. Dimming Using DC Voltage
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN5333B | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:High Efficiency, High Current Serial LED Driver with 30V Integrated Switch |
| FAN5333BSX | 功能描述:LED照明驱动器 SYSTEM_POWER 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 |
| FAN5333BSX-CUT TAPE | 制造商:FAIRCHILD 功能描述:FAN5333B Series 5.5 V 1.5 MHz High Efficiency High Current Serial LED Driver |
| FAN5333SX | 功能描述:IC LED DRVR WHITE BCKLGT SOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:1 系列:- 恒定电流:- 恒定电压:- 拓扑:PWM，切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:642kHz 电源电压:2.7 V ~ 5.5 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-VFDFN 裸露焊盘 供应商设备封装:10-VSON 包装:剪切带 (CT) 工作温度:-30°C ~ 85°C 产品目录页面:1371 (CN2011-ZH PDF) 其它名称:BD1603NUV-E2CT |
| FAN5336 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:1.5MHz Boost Regulator with 33V Integrated FET Switch |
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