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DRV592: PWM frequency & duty-cycle

Markus Nenonen
Prodigy 30 points
Part Number: DRV592

Hi,

DRV592 has maximum PWM frequency of 1MHz. If I use 1MHz PWM signal can duty-cycle for this part be less than 50%? Or does internal FETs require minimum 500ns control signal in order to turn on? Can for example 1% duty-cycle be used frequency of 1MHz meaning internal FET would be on for 10ns?

  • 0
    TI__Mastermind 22122 points

    Hello Markus, 

    The DRV592 is a rather old device and does not have a programmable duty cycle. 

    All the best,
    Carolina

  • 0 in reply to Caro Walter
    Prodigy 30 points

    Hello Carolina,

    PWM is supplied externally for this IC through it's pins. For example with FPGA. With FPGA I can decide which duty cycle to feed in to this IC. So I am interested if this external PWM on pulse length can be less than 500ns?

    -Markus

  • 0 in reply to Markus Nenonen
    TI__Mastermind 22122 points

    Hey Markus, 

    My apologies I misread your question.

    As stated in the datasheet: "Any PWM modulation scheme may be applied to the DRV592 inputs." 

    So I believe you should not have an issue especially because there is no min or max duty cycle discussed in absolute maximum operating conditions. 

    Later on in the datasheet it does discuss how duty cycle of 50% is worst case scenario. 

    All the best, 

    Carolina 

  • 0 in reply to Caro Walter
    Prodigy 30 points

    Hi Carolina,

    I am just thinking what is the lower limit for the modulation pulse duration that DRV592's internal FETs need in order to turn on. Is it something like 10ns or more? I guess this depends on DRV592's internal FET types and internal gate driver strength.

    -Markus

  • 0 in reply to Markus Nenonen
    TI__Mastermind 22122 points

    Hey Markus,

    This device simply follows the input.  I believe it can go to 100% modulation or full DC.  I did not see anything for pulse injection. 

    If a short pulse, such a 1% or less or 99% or more is placed on the input, the output will follow.  The only timing is the turn off and turn on time that may cause a short pulse to go to full modulation

    All the best, 
    Carolina