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參數(shù)資料
| 型號： | FAN5332A |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | LED驅動器 |
| 英文描述： | High Efficiency, High Current Serial LED Driver and OLED Supply with 30V Integrated Switch |
| 中文描述： | 高效率，高電流串行LED驅動器和30V的集成開關電源的OLED |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 549K |
| 代理商： | FAN5332A |
7
www.fairchildsemi.com
FAN5332A Rev. 1.0.1
F
inductor size, cost and overall efficiency is needed to make the
optimum choice.
The inductor saturation current should be rated around 1.5A,
which is the threshold of the internal current limit circuit. 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 automatic turn-off of
the switching transistor, resulting in higher ripple and reduced
efficiency.
Some recommended inductors are suggested in the table
below:
Table 1: Recommended Inductors
Capacitors Selection
For best performance, low ESR input and output capacitors are
required. Ceramic capacitors of C
placed as close to the IC pins, are recommended for the lower
input and output ripple. The output capacitor voltage rating
should be according to the V
OUT
suggested in the table below.
IN
= 10μF and C
OUT
= 2.2μF
setting.
Some capacitors are
Table 2: Recommended Capacitors
A feed forward capacitor C
mended value (R
1
x C
F
) is around 13μS.
Diode Selection
F
, is required for stability. The recom-
The external diode used for rectification 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.
Thermal Shutdown
When the die temperature exceeds 150°C, a reset occurs and
will remain in effect until the die cools to 130°C, at that time the
circuit will be allowed to restart.
Heavy Load Limitations
In heavy load applications (P
OUT
>1.5W) the power dissipated
in steady state at high ambient temperature can increase the
die temperature to the point where the thermal shutdown kicks
in. To prevent this, a limited time operation should be consid-
ered in applications such as a flash LED driver. An operation
time of 0.4Sec. at maximum load, followed by a 3.6Sec. OFF
time ensures stable operation even in the worst case, provided
that the IC heat dissipation is optimized to lower the junction to
ambient thermal resistance.
The external passive components and the layout of the PCB
play an important role in reaching the highest efficiency of the
boost converter. For best results, the data sheet recommenda-
tions regarding external components and PCB layout should be
followed closely.
PCB Layout Recommendations
The inherently high peak currents and switching frequency of
power supplies require careful PCB layout design. Therefore,
use wide traces for high current paths and place the input
capacitor, the inductor, and the output capacitor as close as
possible to the integrated circuit terminals. The resistor divider
that sets the output voltage should be routed away from the
inductor to avoid RF coupling. A two layer PCB with the bottom
layer as ground plane connected to the pin 2 of the IC is recom-
mended. This ground plane acts as an electromagnetic shield to
reduce EMI and parasitic coupling between components.
Figure 5. Recommended PCB Layout
Inductor
Value
Vendor
Part Number
Comment
6.8μH
TDK
SLF7028T6R8M1R3
Low Profile
6.8μH
MURATA
LQ566C6R8M04
High
Efficiency
6.8μH
COOPER
SD414-6R8
Small Size
Capacitor
Value
Vendor
Part Number
10μF
Murata
GRM31CR70J106KA01B
2.2μF
Murata
GRM32RR71E225KC01B
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5332ASX | 功能描述:直流/直流開關轉換器 1.6MHz BOOST REGULATOR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| FAN5332ASX_NL | 功能描述:LED照明驅動器 1.6MHz Boost regulator RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| FAN5333A | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:High Efficiency, High Current Serial LED Driver with 30V Integrated Switch |
| FAN5333ASX | 功能描述:直流/直流開關轉換器 SYSTEM_POWER RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| FAN5333B | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:High Efficiency, High Current Serial LED Driver with 30V Integrated Switch |
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