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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  
Output Power Calculation  
By making the above assumptions for inductance and  
peak current the output power can be determined by:  
Operating frequency can be derived by:  
1
F =  
(TON + TOFF  
)
(VOUT-VIN) x (IPK + IMIN  
)
TOFF  
POUT  
=
x
2
(TON + TOFF)  
Capacitor selection  
Note: VOUT = output voltage + Schottky rectifier voltage  
drop  
For pulsed operation, as in the maximum battery life  
solution, no capacitors are required at the output to  
the LED. For rectified operation, as in the maximum  
brightness solution, a small value ceramic capacitor  
is required, typically 2.2uF.  
where  
Generally an input capacitor is not required, but a  
small ceramic capacitor may be added to aid EMC,  
typically 470nF to 1uF.  
TOFF 1.7µs (internally set by ZXSC300)  
and  
Demonstration board  
TOFF(VOUT VIN)  
TON  
=
A demonstration board for the Maximum battery life  
solution, is available upon request. These can be  
obtained through your local Zetex office or through  
Zetex web pages. For all reference designs Gerber  
files and bill of materials can be supplied.  
VIN  
and  
( VOUT - VIN ) x TOFF  
L
IMIN = IPK  
Layout of Maximum battery life solution  
Top Copper  
Drill Holes  
Bottom Copper  
Silk Screen  
ISSUE 3 - NOVEMBER 2006  
9