Other Parts Discussed in Thread: LM3409
The product I designed USES the LM3409 chip as the constant current drive source of the relay, which needs to provide about 3.5a constant current of 100mS after power on, and then provide about 800mA constant output current, and the load resistance is 2-3R.
The problems we encountered in debugging are as follows:
(1)LM3409 Unable to output constant current,current varies with load.
(2)When the load is below 3R, the system has no output.
Please give some advice on the above questions，thank you.