Other Parts Discussed in Thread: LM5112
Dear people
I have connected the two dimming Pins (DIM1 and DIM2) together to one PWM Input channel and want to use it to pulse two LED chains connected to IOUT1 and IOUT2.
So I have three connections, 24V, GND and PWM_IN.
When I connect PWM_IN over the Rcomm Resistor to VCC and switch the whole circuit on, PWM_IN is always high and the LEDs are on.
When I don't connect PWM_IN, it is (should be) internally grounded. Swiching on the circuit, the LEDs are off, which is correct.
Now when I connect PWM_IN to high, after I have switched on the circuit, there is a short 'click' and the driver is damaged.
So the whole thing works only with PWM_IN already high.
Until now, I haven't yet tried to pulse/dim over PWM_IN because of above reason.
Then I connected 24V and GND of the pcb, connected the ground of a function generator output to the same GND, connected +3V of the function generator to PWM_IN, switched on the circuit, then switched on the
output of the function generator -> same result, LED Driver damaged.
Does anyone has an idea what I'm doing wrong?
Thanks for any help.