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DRV5013: what's the ripple current when VCC is 18V

Wiky Liao
Intellectual 1590 points
Part Number: DRV5013

Hi Team,

The DRV5013 datasheet describe the VCC power should have less than 50mVpp variation. The reuqirement looks strict, especially in high VCC application, for example: 

For 3.3V power supply, 0.05V/3.3V*100%=1.5%,   

For 18V power supply, 0.05V/18V*100%=0.27%

It is really tough to get such high accuracy power, and when used in BLDC, the power will change significant during motor start-up, if we use 18V to power DRV5013 directly, it is impossible to meet 50mV requirement.

May I have your DRV5013 power supply recommendation for 18V rail? thanks. 

  • +1
    TI__Genius 15300 points

    Wiky,

    Thanks for reaching out on E2E.  The device is designed to operate up to 38V, so exceeding 50 mV on an 18V supply will still be within the operating range of the device.  I believe this caution is intended to limit any Vcc dependent variations in device behavior.  Section 6.8 contains plots of various parameters and shows how a typical unit might behave.  We see that Icc, Switching thresholds (BOP and BRP), Hysteresis, and Offset all plotted with respect to Vcc.  

    To achieve the most uniform performance, limiting the supply ripple will help.  The easiest way to limit this is through the addition of a second larger decoupling capacitance in addition to the 0.01 uF.  

    Thanks,

    Scott

  • 0 in reply to Scott Bryson
    TI__Intellectual 1590 points

    Thanks Scott, it is helpful.