Really?A special property of your current regulator is that it starts with a current peak when you switch on the enable transistor. This should be fixed.
You are right. The current sense connection is so that the controller starts from minimal current.Then I checked the circuit.
When you switch ON the transistor, then it was OFF before. So high ohmic on the DRAIN. This means high voltage at the DRAIN, thus high FEEDBACK voltage.
Thus I expect the OPAMP output to be LOW.
Any 5 mm LEDs with 5V on DAC and draw 41 mA will slowly burn out LED, regardless of supplier
This is a design fault.
Here is another approach.Hi All,
We are using a blue LED in our design From Rohm and We have been having premature LED failure within a month from the field.
I am not sure what's going with the LED driver.
I have attached the driver circuit/datasheet for your review and help would be greatly appreciated.
Thanks,
WJ
View attachment 188932
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