WS2801 output voltage

Other Hardware LEDs and Multiplexing
1

Hi,

I'm designing a circuit with a WS2801 chip (datasheet: http://www.adafruit.com/datasheets/WS2801.pdf). I'd like to use the constant current mode. The value of the resistor on xFB is calculated using the formula Vref/Ixout=Rxfb -> 0.6V/0.02A=30ohm. So the current is limited to 20mA. But what will the output-voltage be or how can I set it?

Thanks!

2

So the current is limited to 20mA. But what will the output-voltage be or how can I set it?

You can't set it.

The output voltage will be what ever it takes to drive 20mA through the load you attach.