astock
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op amp current source
Hello,
First post here, so here goes..
Attached is a circuit that is fabricated on a 1" board and is used to drive a separate high power LED at 350mA. The problem is that this circuit seems to be very susceptible to damage from momentary transients i.e. with system power removed a 12V cap discharged to the 5V line causes damage (the MAX4230 has a max input of 6V - I know, I know, I should just avoid shorting things
)
But even brand new and unused driver boards are prone to "leakage", where the LED lights even with zero volts to Vin. It seems to me that there should be some fairly simple ways to make this a bit more robust without sacrificing any of it's ability.
If anyone can either make a few quick suggestions, or point me to good practical circuit references, it would be greatly appreciated.
Hello,
First post here, so here goes..
Attached is a circuit that is fabricated on a 1" board and is used to drive a separate high power LED at 350mA. The problem is that this circuit seems to be very susceptible to damage from momentary transients i.e. with system power removed a 12V cap discharged to the 5V line causes damage (the MAX4230 has a max input of 6V - I know, I know, I should just avoid shorting things
)But even brand new and unused driver boards are prone to "leakage", where the LED lights even with zero volts to Vin. It seems to me that there should be some fairly simple ways to make this a bit more robust without sacrificing any of it's ability.
If anyone can either make a few quick suggestions, or point me to good practical circuit references, it would be greatly appreciated.
