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UCC27712EVM-287: half bridge 0 / 250V TTL controlled

amos cardano
Prodigy 60 points
Part Number: UCC27712EVM-287
Other Parts Discussed in Thread: UCC27712

Goodmorning,

I bought and tested "UCC27712EVM-287" and I sow that this component can switch 0V /250V at the output only if the inputs is PWM controlled.

Can you help me to find a right component that can switch 0V / 250V controlled by a TTL?

thank you

  • 0
    TI__Guru**** 189401 points

    Hi, Amos,

    Welcome to e2e, and thanks for your interest in our products.

    Section 6.3 Configuring the UCC27712 EVM Into a Synchronous Buck Converter of the EVM Users Guide (link) shows an example of this EVM being used to drive a Synchronous buck converter.

  • 0 in reply to Don Dapkus
    Prodigy 60 points

    Hi Don,

    thank you, but I have already read this guide.

    I need a component that can drvive an half bridge to switch 0/250V at the output and must be work not only continuos fast switching but olso just for switching to 250V for long time and to 0V for long time. The problem of this components is the boot strap that can work only in fast continuos switching.

    best regards

    Amos Cardano

  • 0 in reply to amos cardano
    TI__Genius 13445 points

    Hello Amos,

    If i understand correctly, your application requires longer duty cycle operation and the bootstrap method is not suitable for design? Please confirm my understanding. If so, what is your expected duty cycle? 

    If my assumptions are correct, you might consider an dedicated bias supply for the high-side to maintain HB-HS above the driver's UVLO thresholds as discussed below.

    Otherwise, please let us know with further clarifications.

    Regards,

    -Mamadou

       

  • 0 in reply to Mamadou Diallo
    Prodigy 60 points

    Hi Mamadou,

    yes you understand well. Depend of the situation, some time I need 250V at the output for 1 minute or 100usec, some time I need 0V at the output for 10 second or 100usec.

  • 0 in reply to amos cardano
    TI__Mastermind 23045 points

    Hello Amos,

    Yes, the link that Mamadou provided is the floating bias solution that allows the high side driver bias to support long on times, or DC, operation of the high side driver.

    Please confirm if this information is what you need to resolve your concerns.

    Regards,

  • 0 in reply to Mamadou Diallo
    Prodigy 60 points

    Hi Mamadou,

    with isolated voltage now the circuit work well thank you. My issue now is the dimensions and costs becouse I need to put 12 circuit in the same board (with 12 trasformer, 12 driver, ecc.). Can you suggest me a simpler circuit for realizing an SPDT (time switching 1usec) that can switch 0V / 250V?

  • 0 in reply to Richard Herring
    Prodigy 60 points

    Hi Richard,

    with isolated voltage now the circuit work well thank you. My issue now is the dimensions and costs becouse I need to put 12 circuit in the same board (with 12 trasformer, 12 driver, ecc.). Can you suggest me a simpler circuit for realizing an SPDT (time switching 1usec) that can switch 0V / 250V?.

    thank you

    best regards

    Amos Cardano

  • 0 in reply to amos cardano
    TI__Mastermind 23045 points

    Hello Amos,

    Depending on the current required, and importance of timing and delays, it may be easier to drive a P-channel high side switch and N-channel low side switch. For driving the Pchannel, it can be driven with an open drain transistor and a low side referenced gate drive signal. This would save some components compared to the N channel high side floating gate drive.

    Confirm if this addresses your questions, or you can post additional questions on this thread.

    Regards,

  • 0 in reply to Richard Herring
    Prodigy 60 points

    Hi Richard,

    this solution is not very fast, I have ti switch 0/250 in 1 usec and the power consumption at the 250V is less than 1mA for all 24 output.

    I need a components like this MADR-010574 (macom) whitout shunt controller and cheaper.

    Do you have any suggestion?

    Thank you

    Best regrards

    Amos Cardano

  • 0 in reply to amos cardano
    TI__Mastermind 23045 points

    Hello Amos,

    This does sound like a unique application with low power and current compared to the UCC27712EVM-287 capability. I am not aware of the best solution for the higher voltage but low current targeted solution.

    The UCC27712 driver can work and maybe you can minimize the cost by using low current FET's such as the LND250K1-GCT-ND from Microchip, the datasheet is on Digikey's website.

    Other than minimizing cost of the external components with the UCC27712, based on the low power level. I am not sure what to suggest.

    Regards,