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DRV8243-Q1: DRV8243-Q1 Load Dump in 24V system

Ajesh Mangalassery
Prodigy 10 points
Part Number: DRV8243-Q1
Other Parts Discussed in Thread: DRV8705-Q1, , DRV8245-Q1, DRV8244-Q1, DRV8703-Q1, DRV8262, DRV8262-Q1

Hi ,

We are planning to use DRV8705-q1 for driving a  brushed Dc motor of 8A A(apx).

Need clarification on below points.

1) system is 24Volt and and same is directly powering the H-Bridge, is it is recommended to use DRV8243-Q1in 24V system after considering the load dump situation?

2) if we cannot use DRV8243-Q directly in 24V system what would be the better option to drive the BDC in 24 vot system.

  • 0
    TI__Mastermind 22125 points

    Hi Ajesh,

    1) The absolute maximum voltage specification for the DRV8243-Q1 is 40 V and operating max. voltage is 35 V. As long as the load dump situation does not pump the supply voltage above 35 V it can be used in 24 V applications. We have customers using it in 24 V applications. Would be important to address the load dump issue like you mentioned.

    Please use the Full-bridge junction temperature estimator to see if the driver can support your load conditions without thermal shut down, https://www.ti.com/tool/download/SLVRBI3. When I plugged in 8 A and 24 V, it shows the DRV8243-Q1 cannot support without a TSD. You may want to use a DRV8245-Q1 the DRV8244-Q1 may work but margins may be lower.   

    2) If this would be an automotive application you may want to consider smart gate driver such as the DRV8703-Q1 or higher versions of it with external power FETs. 

    3) We have a higher voltage integrated driver the DRV8262 for up to 65 V with two H-bridges that can connected in parallel mode, https://www.ti.com/lit/ds/symlink/drv8262.pdf.

    Is this an automotive application?

    Regards, Murugavel 

  • 0 in reply to Murugavel4637
    Prodigy 10 points

    Hi Murugave,

    Thanks for the response.

    I missed to mention that, it is a automotive application.

    From your first point i think , it is not safe to use DRV8243-Q1.

    it would be great if you suggest integrated H-bridge for 24V automotive application or H-Bridge driver for the same application.

  • 0 in reply to Ajesh Mangalassery
    TI__Mastermind 22125 points

    Hi Ajesh,

    Without considering the load dump situation you can definitely use the DRV8245-Q1 (not the DRV8243-Q1) for 24V and 8A automotive application. When you instantly brake a running BDC motor there will be load dump into the power supply increasing the supply voltage momentarily depending on the quality of the power supply. There is a chance you'd exceed the 35V max. operating voltage and potentially damage the device. This can be mitigated using a controlled acceleration (speed ramp up) and deceleration (speed ramp down) profile with the PWM duty cycle used for driving the motor.

    Alternatively you can consider our upcoming DRV8262-Q1 automotive device. The industrial version of this device DRV8262,  https://www.ti.com/product/DRV8262 and its EVM are currently available. For evaluation and development purpose you may use this device. The automotive version DRV8262-Q1 is expected to be released in 1Q24. These devices feature 65 V maximum operating voltage hence can handle a higher load dump situation. Thanks.

     

    Regards, Murugavel

  • 0 in reply to Murugavel4637
    Prodigy 10 points

    Hi Mrugavel,

    Thanks for response.

    The suggested part (DRV8262-Q1) is seems to match with our requirements. only worry about the ASIL rating of the part.
    May I know the ASIL Grade of the suggested part.

    Thanks

    Nithin

  • 0 in reply to Ajesh Mangalassery
    TI__Mastermind 22125 points

    Hi Nithin,

    Thank you. The DRV8262-Q1 will have documentation supporting functional safety like FMD, pin FMEA and FIT similar to our DRV824x-Q1 family of devices. Although these devices are not designed to a specific ASIL rating they are functional safety capable and are used in such applications by automotive OEMs for ASIL systems. 

    Do you have a TI sales and / or FAE contact in your region? Thanks.

    Regards, Murugavel

  • 0 in reply to Murugavel4637
    Prodigy 10 points

    Hi Murugavel,

    Thanks for the information.

    Yes we have local contact details of TI.

    Thanks for the support .

    I have some other queries also which is related to H-Bridge gate driver.

    Application is 24V automotive system.

    Requirement is H-Bridge gate driver suitable for driving BDC motor, locks, and solenoids, (24VR8A max)

    Could you please suggest the same .

    Thanks in advance .

    Nithin

  • 0 in reply to Ajesh Mangalassery
    TI__Genius 10135 points

    Hi Ajesh,

    1) I know Murugavel already mentioned the DRV870x-Q1 Automotive H-Bridge Gate Driver datasheet (Rev. E) family of devices.

    2) Another option is the DRV871x-Q1 Automotive Multi-Channel Smart Half-Bridge Gate Drivers With Wide Common Mode Inline Current Sense Amplifiers datasheet (Rev. C).

    They both fit your voltage requirements and the current for gate drivers is determined by the external FETs. There is more margin on the power supply voltage for the DRV870x family of devices from your desired VM. Here is also a good application note on smart gate drive utilized by both family of devices:

     Understanding Smart Gate Drive (Rev. D) (ti.com).

    Best,

    Keerthi