Driving a WS2811 strip

[Jarda]

Hello BAM,

thank you for your question. I think solution is simple. As you already wrote, used high side driver is not suitable for higher speed switching and is not going correctly to zero (reason of measured 11-12V). Solution can be to reduce the communication speed.

Used switch has following timing parameters:

Turn ON Time(to 90% of Vout) 90-170us

Turn OFF Time (to 10% of Vout); 90-230us

So if you want to really use the screw terminal, you should use something around 1kHz.

What communication speed you are using please?

Also high side driver needs some load to work properly, try also to use some load in parallel to WS2811 input.

BR

Jarda

[bam]

Hello Jarda,

Thank you for your quick response!

According to the data sheet, transmitting one bit of information to the WS2811 takes about 2.5 us in slow mode. Which translates to a frequency of 400 kHz. Lowering the transmission speed sadly isn’t an option because the IC can’t read data that’s being sent at a lower frequency. So I guess I’ll have to use the pin header…

As for the PWM issue, just now I put a 1kOhm resistor in parallel to my multimeter, loaded the Fade program from yesterday and I now get correct readings froom 0.2V to 12.3V! So that’s solved. Thanks a lot!

[Jarda]

Hello BAM,

thank you for response and enjoy the CONTROLLINO !

BR

Jarda