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ZXSC300E5TA 参数 Datasheet PDF下载

ZXSC300E5TA图片预览
型号: ZXSC300E5TA
PDF下载: 下载PDF文件 查看货源
内容描述: 单个或多个单元LED驱动器解决方案 [SINGLE OR MULTI CELL LED DRIVER SOLUTION]
分类和应用: 驱动器接口集成电路光电二极管
文件页数/大小: 12 页 / 188 K
品牌: ZETEX [ ZETEX SEMICONDUCTORS ]
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ZXSC300  
APPLICATIONS INFORMATION  
The following section is a design guide for optimum  
converter performance.  
The Zetex FMMT617 is an ideal choice of transistor,  
having a low saturation voltage. A data sheet for the  
FMMT617 is available on Zetex web site or through  
your local Zetex sales office. Outline information is  
included in the characteristics section of this data  
sheet.  
Switching transistor selection  
The choice of switching transistor has a major impact  
on the converter efficiency. For optimum  
performance, a bipolar transistor with low VCE(SAT) and  
high gain is required.  
Schottky diode selection  
For the maximum battery life solution a Schottky  
rectifier diode is required. As with the switching  
transistor the Schottky rectifier diode has a major  
impact on the converter efficiency. A Schottky diode  
with a low forward voltage and fast recovery time  
should be used for this application.  
Inductor selection has a significant impact on the  
converter performance. For applications where  
efficiency is critical, an inductor with a series  
resistance of 500mor less should be used.  
Peak current definition  
The diode should be selected so that the maximum  
forward current is greater or equal to the maximum  
peakcurrentin the inductor, and the maximum reverse  
voltage is greater or equal to the output voltage.  
The peak current rating is a design parameter whose  
value is dependent upon the overall application. For  
the high brightness reference designs, a peak current  
of was chosen to ensure that the converter could  
provide the required output power to the LED.  
The Zetex ZHCS1000 meets these needs. Datasheets  
for the ZHCS Series are available on Zetex web site or  
through your local Zetex sales office. Outline  
information is included in the characteristics section of  
this data sheet.  
In general, the IPK value must be chosen to ensure that  
the switching transistor, Q1, is in full saturation with  
maximum output power conditions, assuming  
worse-case input voltage and transistor gain under all  
operating temperature extremes.  
For the maximum brightness solution a pulsed current  
is supplied to the LED therefore a Schottky rectifier  
diode is not required.  
Once IPK is decided the value of RSENSE can be  
determined by:  
Inductor selection  
VISENSE  
IPK  
RSENSE  
=
The inductor value must be chosen to satisfy  
performance, cost and size requirements of the overall  
solution. For the reference designs we recommend an  
inductor value of 100uH with a core saturation current  
rating greater than the converter peak current value  
and low series resistance.  
where VISENSE=19mV  
ISSUE 3 - NOVEMBER 2006  
8