pier Posted March 29, 2010 Report Share Posted March 29, 2010 Hello all, I have a constant current driver 350mA with an O/P voltage of 40 Vdc, I want to know a way to test the driver without the leds. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted March 29, 2010 Report Share Posted March 29, 2010 It depends on whether it can withstand a short circuit or not.Please post a schematic.An easy way is to connect a 100R power resistor and measure the voltage, it should be 35V.You might be able to get away with a 10R resistor or even just measuring the current with a meter but it depends on the power supply. Quote Link to comment Share on other sites More sharing options...
pier Posted March 29, 2010 Author Report Share Posted March 29, 2010 I dont have a schematic because I bought it from an electronic store, The store owner told me that it could withstand Short ckt. I dont know how far its true. I think I would try the 100ohm power resistor. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted March 30, 2010 Report Share Posted March 30, 2010 The resistor needs to be rated for at least 5W and don't leave it connected for very long - the power dissipation will be 0.352*100 = 12.25W which is much higher than the maximum rating but will be fine, as long as it's only connected for a few seconds and a large heatsink is used. Quote Link to comment Share on other sites More sharing options...
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