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PGA450Q1EVM: Request about PGA450Q1

WonGeun Yoo
Prodigy 230 points
Part Number: PGA450Q1EVM
Other Parts Discussed in Thread: PGA460-Q1, PGA450-Q1, MUX36D08

Hello

I wonder that I bought a car rear sensor and inspect into a car rear sensor

there were connected with 4 transducers on a chip so that I want to connecte with 4 transdusers on a chip like this one

do you have a like chip that I can connecte with 4 transducers?

Or do you know a way that connecting with 4 transducers on a chip?

Please let me know it

Thank you

WonGeun

  • 0
    TI__Mastermind 27780 points
    Hi WonGeun,

    If you'd like to use a single device to control 4 transducers independently, I have tested this concept using the PGA460-Q1 in a half-bridge drive configuration. You can find the details of this approach on the E2E discussion "PGA460-Q1 Multiplexing in Half-Bridge Driver Mode for Mono-static or Bi-static Transducers" at: e2e.ti.com/.../603257

    The problem in trying to multiplex 4 sensors in a transformer mode is you must find a switch/multiplex that will either support the large drive current through the transformer's primary windings (up to 500mA for the PGA460-Q1 and up to 2A for the PGA450-Q1) or support the large excitation voltage at the secondary of the transformer (100~200Vpp). Switches rated this high in current or voltage are usually very large and/or expensive, unless you are able to build a discrete switching solution.
  • 0 in reply to Akeem Whitehead
    Prodigy 230 points

    Hi Akeem

    Thanks for your answer

    I have more question about that I want to apply on PGA450Q1 with MUX36D08 for switching transducers

    I am not suer that MUX36D08 can be allowed the secondary of the transformer ( 135Vpp)

    Can I use it?

    you only mentioned about the PGA460-Q1

    WonGeun

  • 0 in reply to WonGeun Yoo
    TI__Mastermind 27780 points
    Hi WonGeun,

    The MUX36xxx based transducer multiplexing solution is only intended for bridge driven applications up to 36V. A transformer driven application is likely to generate too much voltage at the secondary (typically above 100V), which will damage the MUX36xxx. You will need to use a different part to switch the secondary voltage. I recommend that you post a question on the power-switches form for recommendations on switch these high-voltages.