Jeremy Towers Posted August 9, 2010 Report Share Posted August 9, 2010 Hi. What is the safe maximum load current for the internal 5V supply on the Xtreme? I couldn't find it mentioned in the manual, and I seem to have a lot of sensors to hook up to it. Thanks. Quote Link to comment Share on other sites More sharing options...
Joseph Ottesen Posted August 16, 2010 Report Share Posted August 16, 2010 id like an answer to this as well, cheers Quote Link to comment Share on other sites More sharing options...
Rod Smart Posted August 17, 2010 Report Share Posted August 17, 2010 not knowing exactly what device they are using inside the ECU (don't really want to crack mine open to have a look) I'd say between 1 to 1.5A maximum (they state that these are current limited, but I also don't know if the power out's are unique or shared with internal componentry, not sure what you'd be running to be pulling 1A as its just sensor resistances, the total parallel resistance on the +5V output at 1A is 5 ohms (V=IxR or R= V/I or I=V/R) Measure your total parallel resistance from +5 out to GND, this total should be greater than 5 ohms (to maintain currents below 1A) if its a 7805, approx 2A max (1-1.5 is safety margin, you don't want to hit current limit, if you do, the 5V rail will become either unstable or drop in voltage) Quote Link to comment Share on other sites More sharing options...
Phil Williams Posted August 18, 2010 Report Share Posted August 18, 2010 The Xtreme ECUs +5V output is rated at 1500mA, although you should never get near this with common automotive sensors. The output is protected so you won't damage anything if excessive current is drawn, but the supply voltage will fold back. Hope this helps. Quote Link to comment Share on other sites More sharing options...
Jeremy Towers Posted August 22, 2010 Author Report Share Posted August 22, 2010 Thanks for your replies. 1500mA should definitely suffice. Quote Link to comment Share on other sites More sharing options...
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