duck Posted January 10, 2005 Report Share Posted January 10, 2005 Hi,I'm looking to build a 50VDC power supply to power a 300W Philips BLF278 RF amplifier.I can't seem to find any circuits on the internet which provide the required 50V(ds) ~6A or more to run the thing. Does anyone have any ideas how I would go about modding an existing circuit, can I just change components to handle higher power in an existing 50VDC 3A circuit?Better yet, will the High Current Power Supply in the projects section suit what I'm after, or will I need more precise filtering?The BLF datasheet says the transistor can handle a max drain voltage of 125V, so would I get away with just using a 50V tordinal transformer without any smoothing/regulation?Thanks Quote Link to comment Share on other sites More sharing options...
ante Posted January 10, 2005 Report Share Posted January 10, 2005 Hi duck,Welcome to this forum.What are the manufacturers (Philips) requirements for stability and filtering of the power supply? I seem a bit low (6A) at 50 volts if the power is 300W. Quote Link to comment Share on other sites More sharing options...
duck Posted January 11, 2005 Author Report Share Posted January 11, 2005 What are the manufacturers (Philips) requirements for stability and filtering of the power supply? I seem a bit low (6A) at 50 volts if the power is 300W.I probably agree with you. I have a friend who owns a commerical FM amplifier, though with a different MOSFET. He says at times up to 8 or 9 amps is drawn.Class B operation for the BLF177 gives 70% efficency, about 19-20db gain.LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134).SYMBOL PARAMETER CONDITIONS MIN. MAX. UNITVDS drain-source voltage - 110 VVGS gate-source voltage - 1877.PDF Quote Link to comment Share on other sites More sharing options...
ante Posted January 11, 2005 Report Share Posted January 11, 2005 Hi duck,It would be interesting to know which kind of PSU (stabilized or not) your friend is using. Anyway I wouldn Quote Link to comment Share on other sites More sharing options...
duck Posted January 12, 2005 Author Report Share Posted January 12, 2005 No problem, I was only tossing ideas around.The BLF177 is about $200 anyway, and for my first major electronics project I think I'll choose something a little cheaper and easier to power. I'll let you know if I have any more questions.Thanks, very helpful! Quote Link to comment Share on other sites More sharing options...
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