On Aug 21, 2009, at 7:52 AM, Carl Denk wrote:

> I have 6 LED driver outputs, so far I have replaced 2, could have  
> been accidental shorting during testing, or ESD??

The drivers have burnt out, or the LEDs?


> This goes to a ZTX603 NPN Darlington Transistor... The Transistor  
> emitter is to ground, and the transistor collector > 10 ohm  
> resistor ... The return is to 5 VDC

Close to half a watt dissipated by a TO92 would make me uncomfortable  
(even though it's within specs) unless I was paying a lot of attention  
to the fine print the the datasheet about copper area and lead length  
and such.  How hot do they get?

BillW
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