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TAS56xx series possible for current waveform generator?

Other Parts Discussed in Thread: TAS5611, TAS5631

Hello to all!

I'm a student in electrical engineering and I have to build a high accuracy signal amplifier for my end of studies project. Part of this task is to provide three current channels (3ph system) which can drive up to 15A peak into more or less a short circuit (Current transformer with connection lines: R<1 Ohm inductive). Nominal operation is at 1A or 5A AC with frequencies of 50/60Hz.

This problem can be solved with an H-bridge and normally I have to generate the driving signals for the H-bridge myself and build a feedback loop with a PI-regulation. From what I can gather from the datasheets it could be possible to do this with a TAS5611/13, which has an H-bridge in the output stage and in the functional block diagram there is a feedback loop from the output to the input.

The problem i have is to understand how the TAS56xx series works.... Can the TAS56xx be viewed as a tension input current amplifier? What I need in my project is a constant gain and high temperature stability from the input to the output; hence an input of 3V should always generate the same output current even if the load changes slightly through temperature drift. The advantage the TAS56xx has is the high efficiency and the already integrated driving circuitry, which would simplify my work substantially

I hope I was able describe my problem precisely enough and hope to hear from you soon.

Frank

  • Hi, Frank,

    The TAS5611/13 are PWM input power stages. The current regulation will be dependent on your loop; our chip just takes the input PWM signal, and replicates it on the outputs. We do have feedback to correct for changes in the power supply voltage.

    I am also not sure we can drive your load --- one ohm is pretty tough. If you decide to try it, look at TAS5631, it has much higher current drive capabilites.

    -d2

  • Hello Don,

    Thanks alot for your answer! With your information it looks to be a bit to complex to implement this switching solution with a whole feedback loop instead of a linear solution with an OPAMP.

    Thanks again and all the best!

    Frank