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參數(shù)資料
| 型號(hào)： | KAB3405T |
| 廠商： | KEC Holdings |
| 英文描述： | Step Up Type DC/DC Converter for White LED |
| 中文描述： | 升壓式直流/直流轉(zhuǎn)換器，用于白光LED |
| 文件頁數(shù)： | 5/7頁 |
| 文件大小： | 623K |
| 代理商： | KAB3405T |
2007. 4. 2
5/7
KAB3405T
Revision No : 0
Current Dimming Control
Recommended Brightness Control Circuits are 4 types.
1) Input PWM signal to SHDN terminal
I
F
can be adjusted with PWM signal by inputting it to SHDN terminal.
[Notice]
<<PWM signal frequency>>
The recommended PWM signal frequency is from 100 Hz to 10 kHz. There is a possibility to arise the
audible frequency in mounting to the board because it is within the auditory area.
<<Constant number of external condenser>>
To reduce the fluctuation of input current and increase the accuracy of brightness, the values that C
IN
=
4.7 ( F) or more , C
OUT
= 1.0 ( F) or less are recommended.
When the PWM signal is off, the time to drain C
OUT
of charge depends on the constant number. And so,
the actual value is little different from the theoretical value.
<<PWM input signal>>
Set the amplitude of PWM signal within the range of SHDN terminal specification.
<<Rush current in inputting>>
In case dimming by inputting the PWM signal to the SHDN terminal, this IC turns on and off
repeatedly.
And the rush current, which provides the charge to C
OUT
, arises in turning on. Take care in selecting the
condenser.
<<Current value in Control with PWM: Ideal Equation>>
I
F
[mA] =
<<Recommended application>>
300 [mV]
ON Duty [%]
R
SENS
[
]
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| KAB3405T_08 | 制造商:KEC 制造商全稱:KEC(Korea Electronics) 功能描述:Step Up Type DC/DC Converter for White LED |
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