jhanus Posted March 29, 2007 Report Share Posted March 29, 2007 Hi,I found at my local shop voltage regulator TL783 (http://www.ortodoxism.ro/datasheets/texasinstruments/tl783.pdf), it can regulate from 0-125V, I can't use any other regulator because my input voltage is 40VDC.Problem is that this regulator from characteristics can only deliver around 700mA output at input-to-output voltage differentials of 25 V, but I need 3A.So can somebody help me to add current boost like it's done here (http://ourworld.compuserve.com/homepages/Bill_Bowden/page12.htm#317pass.gif), under title "LM317T Voltage Regulator with Pass Transistor".In datasheet there is circuit for current boost, but I would prefer method above.How to calculate this components would be of great help, because there is high probability that I can't buy the same transistors.Thank you. Quote Link to comment Share on other sites More sharing options...
audioguru Posted March 29, 2007 Report Share Posted March 29, 2007 The TL783 has a dropout voltage of about 12V. So current-boosting transistors must be paralleled to be able to dissipate the high amount of heat. Quote Link to comment Share on other sites More sharing options...
jhanus Posted March 29, 2007 Author Report Share Posted March 29, 2007 Thanks for response,Let say that I will be satisfied even if I get 1.5A at 10V (40VDC-30VDC).Can you put equation for calculating current-boosting transistors or schematic?! Quote Link to comment Share on other sites More sharing options...
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