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PGA460-Q1: Drive Capacity

Kuramochi Tadahiko
Guru 28715 points
Part Number: PGA460-Q1
Other Parts Discussed in Thread: PGA460

Hi,

My customer would like to drive the transducer on the below condition.

Frequency: 220kHz, Capacitance: 2100pF, Voltage: 200Vp-p

Do you think that can the PGA460-Q1 drive it using a transformer?

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 27950 points
    Hi Kuramochi,

    Yes, the PGA460-Q1 supports transducers in the range of 30-80kHz and 180-480kHz. To effectively drive a 220kHz, 220Vpp transducer, you will need to use a high-frequency compatible transformer.

    For a 220kHz transducer specifically, consider the following transformers:
    • TDK B78416A2386A003
    • Wurth 750316928
    • Pulse PH9185.013NLT

    You can find additional transducer and transformer part numbers on the E2E discussion "Air-Coupled Ultrasonic Transducers & Transformers Listing" at:
    e2e.ti.com/.../620399
  • 0 in reply to Akeem Whitehead
    Guru 28715 points

    Akeem-san,

    Thank you for your answer.

    I estimated easily as belows.

    Is a transformer driver not required?

    Q=2200pF*200V=220nC

    Driving time=220nC/500mA(PGA460 output current)=0.44us

    T=1/220kHz=4.5us

    0.44us/4.5us≒10%

    Best Regards,

    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Mastermind 27950 points

    Hi Kuramochi-san,

    The requirement of a transformer is typically based on the maximum drive voltage requirement. This is because as drive voltage increases, so does the maximum generated sound pressure level output from the transducer, enabling long range detection.

    When using the PGA460, the following driver modes can be used with respect to maximum drive voltage:

    • <30V = Half bridge
    • 30-60V = Full bridge or transformer
    • >60V = Transformer

    If your application only requires short range measurements (<2m), then it is possible to use a half bridge or full bridge driver with a transducer rated for 200Vpp.

    The E2E forum was undergoing maintenance yesterday, so the link may have been temporarily disabled when you attempted to view the page.
    The link is now working again. Alternatively, try this link: e2e.ti.com/.../620399

  • 0 in reply to Akeem Whitehead
    Guru 28715 points

    Hi Akeem-san,

    Thank you for your support.

    Can PGA460 drive "Wurth 750316928” directly?
    Or is a transformer driver needed?

    Best Regards,
    Kuramochi

  • 0 in reply to Kuramochi Tadahiko
    TI__Mastermind 27950 points
    Hi Kuramochi-san,
    Yes, the PGA460-Q1 uses a push-pull driver mode through the Wurth 750316928 transformer to excite a high-frequency transducer.