Russ7284 Posted February 28, 2006 Report Share Posted February 28, 2006 Hello, I am building a motor driver circuit and the ULQ2003A works great for me. That is until I changed the motor out, now my motor is drawing 2 amps rather that 350mA. My question is, is there a substitute for the ULQ2003A Darlington Transistor Array that can handle 2- 4 amps at 5vdc. I seemed to have melted the last 2, as well as ruined one of my test boards. Thanks in advance.-Russ Quote Link to comment Share on other sites More sharing options...
ante Posted February 28, 2006 Report Share Posted February 28, 2006 Hi Russ,You have to "boost" the outputs of the array with power transistors for this level of current! The ruined board is probably not made for this current and you better build the “boost” circuit on a PCB. Quote Link to comment Share on other sites More sharing options...
Russ7284 Posted February 28, 2006 Author Report Share Posted February 28, 2006 So should I connect the output of the ULQ2003 to the base and the emitter to ground and the collector to the motor coil? or is there a better method? Would I need a pull-up resistor in this case? Quote Link to comment Share on other sites More sharing options...
ante Posted February 28, 2006 Report Share Posted February 28, 2006 Hi Russ,These circuits does not use the same driver circuit as you do but they might give you some idea. ;) Quote Link to comment Share on other sites More sharing options...
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