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use of TPS5124 in as 3 phase PWM controller

Art Grandle
Prodigy 100 points
Other Parts Discussed in Thread: TPS5124, TL494

I have several antique cars with 6 volt battery systems. I would like to replace the generator with a 12 volt alternator and a small 12 volt battery. I am trying to design a buck converter which will take the 12-15 volt output of the 12 volts system and charge the 6 volt battery (replacing the 6 volt generator). The 6 volt generator has a 30 amp output.

I am looking at using 2 TPS5124 devices in a 3 phase application. I purchased the eval board but it does not show any 3 phase connection options and I am finding the data sheet to be vague in how to do this. I also am curious as to whether this part is appropriate since the max supply is 15 volts. Would I be better off using a different controller.

Suggestions and thoughts appreciated.

Art Grandle

  • 0
    TI__Guru**** 191445 points

    Just curious, but what type of antique cars?  I think there are conversions available to convert from 6 V to 12 V systems.  Alternately, you could replace the 6 V generator with the 12 V alternator and charge the 6 V system from the 12 V dc using a single step down converter.

  • 0 in reply to JohnTucker
    Prodigy 100 points

       The cars are 3 model A Fords and a 1931 Cadillac. The usual conversion process is to replace the generator with a 12 volt alternator and use resistors to drop the voltage to devices that have to remain at 6 volts such as the horn, and motors for things like the heater. The problem on the Cadillac is that it has 3 heater motors. What you are suggesting is what I tried to say that I am attempting to do. Basically I want to install a 12 volt alternator and have a 12 volt system with a switching regulator which charges the 6 volt system.

    I tried buying a 24 volt to 12 volt buck regulator which has a 30 amp output. It uses a TI TL494 regulator. I reset the voltage feedback resistors to 6 volts but then I found that the current sense resistor was in the ground output and this required the supply to be isolated. NG. So I am back to designing my own switching regulator.

    If you would like I can send you some car pictures.

    Art Grandle