I am trying to get a AL8861 LED driver hooked up based on the wiring diagram in PFC_EDU. Right now I’ve connected it to a single LED (this one) to test (see circuit below). I eventually intend to connect it to the DAC5578 Digital to Analog converter to communicate via I2C. For now, I’d like to test if the lighting circuit works.
I’ve connected the components and supplied 24v. As soon as I plugged it in, the LED flashed and then went dark. I’ve also tried connecting VSET to ground, and it begins to glow slowly but remains very dim. I tried connecting VSET to +3v and +5v (probably a bad idea) and it flashed again. Now when I connect VSET to ground I get no glow.
I get some weird results when I check the test pads voltages. Here are the readings:
- (+24v) 24.30v
- (VSET) 23.93v
- (CH1+) 24.30v
- (CH1-) 24.27v
I thought VSET would float. When I connect it to ground, it has ~60mA of current running through it.
Is my circuit wrong in some way? I appreciate any help. Thank you!