nissim69 Posted December 20, 2010 Report Share Posted December 20, 2010 Can someone point me to some demo schematic for step down DC-DC 24V to 5V 150A. (Not a mistake. I need 150A Quote Link to comment Share on other sites More sharing options...
Hero999 Posted December 20, 2010 Report Share Posted December 20, 2010 Not you need to a larger magnetic core, just increasing the rating of the semiconductors isn't good enough.You need a multiphase buck converter or a push-pull converter. Quote Link to comment Share on other sites More sharing options...
nissim69 Posted December 25, 2010 Author Report Share Posted December 25, 2010 I have TI design with Two-Phase Synchronous Buck Controller w/Integrated Mosfet Drivers.base on TPS40131 (http://focus.ti.com/docs/prod/folders/print/tps40131.html) .... so if I will keep the same design, and just add more power Mosfet in parallel and keep the same coil value micro hanrey, just make it not saturate in 150A all will work ? Quote Link to comment Share on other sites More sharing options...
gogo2520 Posted December 25, 2010 Report Share Posted December 25, 2010 Hello I got a question. What runs on 5Volts and needs 150 amps? gogo Quote Link to comment Share on other sites More sharing options...
nissim69 Posted December 25, 2010 Author Report Share Posted December 25, 2010 36 LED modules that need 4 A every one. Every module has 900 3 color hi bright LEDs. it is a street side display panel that project video in day light. Every 3 LED is RGB pixel. Any Idea about the power supply question? Quote Link to comment Share on other sites More sharing options...
gogo2520 Posted December 26, 2010 Report Share Posted December 26, 2010 How much would a individual module need? reason I as is because it might be easier and safer to have a separate powersupply for each module.gogo Quote Link to comment Share on other sites More sharing options...
nissim69 Posted December 26, 2010 Author Report Share Posted December 26, 2010 Every module consume 4A. 4 X 36 = 144A. so I need to design 150 A.It sees to me much more expansive to build 36 Power supplys. Quote Link to comment Share on other sites More sharing options...
gogo2520 Posted December 26, 2010 Report Share Posted December 26, 2010 No I was thinking you would have to divide the power up 36 times anyways so why not start at that point. first what voltage is coming in to begin with. your not going to get 150 amps off a 110 volt line. Quote Link to comment Share on other sites More sharing options...
nissim69 Posted December 26, 2010 Author Report Share Posted December 26, 2010 The V in is 24 Volt from bus batteries. Every module, has also logic control , so all has reference to GND. meaning I need to send set Pixel command from digital card that has GND and 5V supply.So to cascade all module is will not work. every module will have floating GND. and will not get digital command on his bus. If there is some low cost switching power supply 24 V to 5V 4 A, with cost 1 to 1.5 USD. I can put that power supply near every module. But I do not think I can find that solution. Quote Link to comment Share on other sites More sharing options...
indulis Posted December 26, 2010 Report Share Posted December 26, 2010 Google VRM (voltage regulator module ). Quote Link to comment Share on other sites More sharing options...
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