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DRV10983-Q1: resistor value for linear regulator

Mahendra Patel1
Expert 3560 points
Part Number: DRV10983-Q1

Hello Team,

My customer is planning to use DRV10983-Q1 with regulator in linear mode. The do not have any external load to be powered from DRV10983-Q1.

Can they use 0.2W rated resistor instead of 1/4W?

Continuous max VCC voltage is 24V and transient is 38V

Recommended value for linear regulator in datasheet is 39ohm. can we use 47ohm or 50ohm here?

Regards,

Mahendra

  • 0
    TI__Mastermind 24405 points

    Hi Mahendra,

    Thanks for posting your question in MD Forum! It should be okay to use 0.2W rated resistor but I do not recommend using a higher value resistor as this could impact the design parameters of the voltage regulator which is not desirable because Vreg powers the 3.3V LDO which in turn powers other blocks such as ADC, Current Sense, OCP, Inductive Sense etc.

    Regards,

    Vishnu

  • 0 in reply to Vishnu Balaraj
    TI__Expert 3560 points

    Hello Vishnu,

    You mentioned that you do not recommend using higher value of resistor. does that mean they can use smaller value?

    customer can 32ohm instead of 39ohm? or do you recommend strictly 39ohm only ?

    what is the logic behind choosing this value?

    Regards,

    Mahendra

  • 0 in reply to Mahendra Patel1
    TI__Mastermind 24405 points

    Hi Mahendra,

    We strictly recommend using 39 ohm ONLY. Please see the schematic below:

    39 ohm resistor along with 10 uF cap functions as a Low-pass filer. Changing the resistor value will move the poles and affect the stability, bandwidth and other performance metrics such as line regulation, load regulation etc. 

    Regards,

    Vishnu