Hi forum,I'm working on a interface to controll a special LED stripe via PWM.Special cause they're 2700 K and 6400 K on the stripe, one with a reserved polarity.You can controll the lightcolor via the frequenz that you use to switch between the polarity.For the tested a classic motor driver circuit with an L293 H-Bridge.It works out fine, but the working range of the L293 so to small (just up to 600 mA...)So i'm looking for another H bridge or maybe a better way to controll the LED Stripe.At the end I would like to use DMXControl to controll the stripe, so will need the rightDMX Driver, too.Hope you can help me out, thx
but is it possible to rotate the polarity in a really high frequenz?
You can controll the lightcolor via the frequenz that you use to switch between the polarity.
Forward current+----------+! t1 !+ + +--------------- Zero Current ! t2 ! t3 +----+Reverse current
...for my LEDs 175khz is perfect