• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 514 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS43060EVM-199: Suggestions for simultaneous multiple output voltages

Daniel Miller
Prodigy 40 points

Part Number: TPS43060EVM-199

I need a DC boost converter power source that will provide a constant 40VDC, but will pulse for signalling purposes at 32VDC.  In other words, the circuit will operate at a nominal 40VDC - but will fluctuate down to 32VDC when the controller needs to signal downstream.

The longest pulse duration would be 1ms, with 0.5ms rest between. Typical would be shorter pulses.

The TPS43060EVM-199 looks ideal for my application - preconfigured for 40VDC and it appears simply changing the board's R8 to 277k would give me 32VDC.  So theoretically I could use two of these in parallel, one configured for 32VDC connected to the circuit via a diode - and the second configured at 40VDC again connected with a diode and a FET.  Thus engaging the 40VDC or 32VDC as desired for my pulses.

The question - is there a less costly or otherwise "better" approach?  Is there a way of obtaining both voltages from a single boost converter (perhaps not this model)?  I don't know if a linear regulator can step-down the 40VDC to the 32VDC fast enough for the desired pulsing effect.

  • 0
    TI__Mastermind 46905 points
    Hi Daniel,

    The output voltage of the converter depends on its feedback divider R8, R9, so we can get different voltage with different divider. Use two resistor in parallel to replace the R9. When the two resistor short to ground, the converter output 40V, when only one resistor short to ground, the other one is floating, the converter output 32V.