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參數(shù)資料
| 型號： | FAN5331SX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.6MHz Boost Converter with 20V Integrated FET Switch |
| 中文描述： | 1 A SWITCHING REGULATOR, 1850 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 214K |
| 代理商： | FAN5331SX |
7
www.fairchildsemi.com
FAN5331 Rev. 1.0.1
F
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 in the range 4.7μF to 10μF, 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
setting.
A feed forward capacitor C
F
, is required for stability. The recom-
mended value (R
1
x C
F
) is around 18μS. Some capacitors are
suggested in the table below.
Table 2: Recommended Capacitors
Diode Selection
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.
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 four layer PCB with at least one
ground plane connected to the pin 2 of the IC is recommended.
This ground plane acts as an electromagnetic shield to reduce
EMI and parasitic coupling between components.
Figure 5. Recommended Layout
Application Examples
1. LED Driver
One or more serial LED strings can be driven with a constant
current, set by the series resistor, given by
Figure 6. Low Noise Boost LED Driver
Inductor
Value
Vendor
Part Number
Comment
10μH
Panasonic
ELL6GM100M
Lower Profile
(1.6mm)
10μH
Murata
LQS66SN100M03L
Highest
Efficiency
10μH
Coilcraft
DO1605T-103Mx
Small Size
Capacitor
Value
Vendor
Part Number
4.7μF
Panasonic
ECJ3YB1C475K
4.7μF
Murata
GRM31CR61C475
I
LED
---------------
=
SHDN
V
IN
V
OUT
R1
R2
GND
V
IN
FB
SW
F
A
5
C
IN
4.7
μ
F
10
μ
H
1
3
2
4
5
C
OUT
L
BAT54
4.7
μ
F
2.7V to 5.5V
ON
OFF
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
19.7
19.8
19.9
20.0
20.1
20.2
L
Input Voltage (V)
LED Current vs Input Voltage
(String Connected to FB Pin)
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| FAN5333ASX | High Efficiency, High Current Serial LED Driver with 30V Integrated Switch |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5331SX_Q | 功能描述:IC LED DRVR WHITE BCKLGT SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| FAN5332_BBC3086B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5332A | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:High Efficiency, High Current Serial LED Driver and OLED Supply with 30V Integrated Switch |
| FAN5332ASX | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.6MHz BOOST REGULATOR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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(fēng)格:SMD/SMT |
| FAN5332ASX_NL | 功能描述:LED照明驅(qū)動(dòng)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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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