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ultrasonic piezoelectric transducer

Nithyanandan Ramaraj
Prodigy 30 points
Other Parts Discussed in Thread: PGA460, TUSS4440, TUSS4470

Hello,

My project needs to drive a medium power ultrasonic piezoelectric transducer. The driver designs I have seen for these transducers typically use switching i.e. square waves to drive them, MOSFET  driven, with Vpp 100v-400v in some cases!

Question: Suggest driving Circuit these transducers.Push-pull circuit

* Resonant Frequency: 55 kHz

* Input power: 80W

  • 0
    TI__Mastermind 27950 points

    Nithyanandan,

    You have three device options to meet your driver requirements:

    1. PGA460
    2. TUSS4440
    3. TUSS4470 in pre-driver mode

    You can find a comparison of all three devices and their typical use cases on the Ultrasonic FAQ here: https://e2e.ti.com/support/sensors/f/1023/t/748143

    The type of receiver data and amount of DSP/post-processing you require will determine which device is most suitable. If want to share some additional details about your project (use-case, range, targets, etc.), I can help make a specific suggestion.

  • 0 in reply to Akeem Whitehead
    Prodigy 30 points

    Hi Akeem,

          Thanks for reply, we try to design ultrasonic piezoelectric transducer 55 Khz driving and signals generator

    End application : The Harmonic scalpel is a surgical instrument used to simultaneously cut and cauterize tissue. Unlike Electrosurgery, the harmonic uses ultrasonic vibrations instead of electric current to cut and cauterize tissue.

    ultrasonic piezoelectric transducer Specification :

    Resonant Frequency - 55 KHz

    Resonant Resistant Zr ≤ 20 ohms

    Capacitance =3200 pF

    Mechanical factor Qm ≥ 650

    Bandwidth ≥ 0.5 Khz

    Maximum Power =80 w

    Maximum voltage [Vpp] =450v

    Transducer - Series Resonant type

    I saw so many white paper we tried current control based operating circuit and current level variety control

  • 0 in reply to Nithyanandan Ramaraj
    TI__Mastermind 27950 points

    Nithyanandan,

    Considering you only require an ultrasonic driver, and not a receiver, you should use either the TUSS4440 or TUSS4470 in pre-driver mode as these give you the option to send pulses continuously if required. These devices also offer a logarithmic amplifier based analog front end that you do not require since the application is not for a time-of-flight measurement, but you can still use this feature to check the transducer's health. For example, if the transducer is being driven properly, then a threshold (echo interrupt at pin O4) at the receiver can be set and monitored to confirm a sufficient amount of sound pressure level is being generated by checking O4 for a logic high (3.3V or 5V) level. If the transducer is disconnected or damaged, then the O4 pin will report 0V.

    The TUSS4440 includes powerful integrated low side drivers to connect directly to a push pull transformer to sink up to 500mA through the primary windings. The typical excitation voltage a 1:1:10 turns ratio push-pull transformer at a max supported center-tap voltage of 25V could be up to 500Vpp at the transducer.

    The TUSS4470 in pre-driver mode can be used to control the gate of an external low side driver pair the sink above 500mA through the primary windings. This option is typically required for transducers that require above 500Vpp driving votlage.