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參數(shù)資料
| 型號： | ZXLD1100 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 222K |
| 代理商： | ZXLD1100 |
Open circuit protection
The voltage sense pin (V
) can be connected to the
output to provide open circuit protection for the device
and external circuits when driving series connected
LEDs, thus eliminating the need for an external Zener
diode. Protection is provided by the internal avalanche
diode (ZD), which limits the maximum output voltage
to a value below the breakdown voltage of the output
switch when the connection to the diodes is broken.
Capacitor selection
A ceramic capacitor grounded close to the GND pin of
the package is recommended at the output of the
device. S urface mount types offer the best
performance due to their lower inductance. A
minimum value of 0.22 F is advised, although higher
values will lower switching frequency and improve
efficiency especially at lower load currents. A higher
value will also minimize ripple when using the device
to provide an adjustable dc output current.
A good quality, low ESR capacitor should also be used
for input decoupling, as the ESR of this capacitor is
effectively in series with the source impedance and
lowers overall efficiency. This capacitor has to supply
the relatively high peak current to the coil and smooth
the current ripple on the input supply. A minimum
value of 1 F is acceptable if the input source is close to
thedevice, buthighervalues willimproveperformance
at lower input voltages, when the source impedance is
high. The input capacitor should be mounted as close
as possible to the IC
For maximum stability over temperature, capacitors
with X7R dielectric are recommended, as these have a
muchsmallertemperaturecoefficientthanothertypes.
A table of recommended manufacturers is provided
below:
Manufacturer
Website
Murata
www.murata.com
Taiyo Yuden
www.t-yuden.com
Kemet
www.kement.com
AVX
www.avxcorp.com
ZXLD1100
S E M IC O N D U C T O R S
ISSUE 2 - FEBRUARY 2004
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZXLD1100H6 | 制造商:Diodes Incorporated 功能描述:LED DRIVER ADJUSTABLE SMD SC-70-6 |
| ZXLD1100H6 | 制造商:Diodes Incorporated 功能描述:LED DRIVER ADJUSTABLE SMD SC-70-6 |
| ZXLD1100H6TA | 功能描述:LED照明驅(qū)動(dòng)器 Series/Parallel 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 |
| ZXLD1100H6TC | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH AND OPEN CIRCUIT PROTECTION IN SC70-6 |
| ZXLD1101 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH IN TSOT23-5 |
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