Hi guys, recently I discussed a problem here in this forum and the problem is almost solved (link:Backlight issue)(short:ic that controls mp4player backlight doesn't turn the screen off), only thing remain is that backlight is in a kind of always-on state, it dims and adjust the LED backlight perfectly but doesn't turn it off so battery drains pretty fast .
-How I can use a transistor to sense timeout (which drops voltage on pin#4 from 3.5v to 1.6v) and totally shut the ic (when 3.5v backlight should ON when 1.6v is OFF)
Lm2703 (approximate schematic) :
-How I can use a transistor to sense timeout (which drops voltage on pin#4 from 3.5v to 1.6v) and totally shut the ic (when 3.5v backlight should ON when 1.6v is OFF)
Lm2703 (approximate schematic) :