The brightness adjustment circuit with gated switch ( visible brightness sensor LX1970 )

Published:2012/8/26 22:08:00 Author:Ecco | Keyword: brightness adjustment , gated switch , visible , brightness sensor | From:SeekIC

This circuit has the following characteristics: Firstly, it uses a CMOS gate circuit to control the power on-off of LX1970, only when the output of gate is high, LX1970 get electricity, LX1970 is a micro -power device, so the supply voltage can be provided by gate; Secondly, SRC end is connected to an isolation diode (VD ) in series, when LX1970 power down, VD is cut to play a role in isolation, the luminance signal can not be added to the LX1970; Thirdly, + 3.3V DC voltage signal and PWM signal can be equivalent to the two input signals of the logic oR gate, therefore, changing the DC voltage can also adjust the brightness. VD uses 1N4148 high-speed switching silicon diode.



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