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Original question:

DRV8300: Can it drive 3 pcs of infineon mosfet IPT015N10N5 in parallel ?

DRV8300: Drive brushed DC motor with DRV8300

Gabriel Xu
Intellectual 2145 points
Part Number: DRV8300
Other Parts Discussed in Thread: DRV8874,

Hi Teams

Customer have used DRV8874 (Single H-bridge driver with integrated current sensing) in new project but this device is out of stock.

As they tested DRV8300 for BLDC project in the past and this device is being considering. I am thinking to use two half-brigh and external FET to build a H-bridge to drive brushed DC motor.

In my opinion DRV8300 have capability to achieve this, however, to drive a BDC is not typical application for DRV8300 so I want to double check with you is there any potential risk?

Anything we should be caution for such application senario?  

By the way, I also want to know why DRV8300 release external bootcap diode verison? In what condition customer will prefer external diode version rather than integrated one?

What's the advantage of external diode verison? Thanks in advance.

  • 0
    TI__Intellectual 2145 points

    One more question about control signal:

    As DRV8874 only have two input pin and the logic control mode have shown below:

    As DRV8300 need 4 control signal for H-brigh control, it mean we need two extra GPIO for it.

    I noticed that DRV8300 have INL inverting version, I think if we select inverting version and tie INL and INH together could achieve the same control logic without changing the software. Am I right? Thanks in advance.

  • 0
    TI__Expert 3535 points

    Hi Gabriel, 

    I will get you an answer to this later today. Thanks for your patience.

    Regards,

    Michael

  • 0 in reply to Michael Arrant
    TI__Expert 3535 points

    Hi Gabriel, 

    No issue with using DRV8300. You can use 2 of the three phases on DRV8300 and tie INHA to INLA, the PWM will always turn one on and the other off.

    External Bootstrap Diode

    So, in high frequency or high capacitive load applications the customer may want to pick a bootstrap diode that incurs less losses. I found another TI part that uses bootstrap diodes and has some additional information you may find helpful. 

    https://www.ti.com/lit/an/snva083b/snva083b.pdf

    Please let me know if you have further questions.

    Thanks,

    Michael

  • 0 in reply to Michael Arrant
    TI__Intellectual 2145 points

    Hi Michael

    Thansks for your reply. I am promoting this solution to customer.

    As we only use 2-ch of DR8300, what's the recommend connection for unused channel of DRV8300? (Both INX and OUT pin)

    Could you help me to confirm that if we design with inverting input configuration of DRV8300, we could achieve the sample logic as DRV8874?

    (DRV8874 only have two input control pin IN1 and IN2, and the control logic have shown in previous threads)

  • 0 in reply to Gabriel Xu
    TI__Expert 3535 points

    Hi Gabriel,

    Please ground the inputs of the unused channel.

    Since you are using DRV8300 in inverting mode and tying the inputs together then yes the configuration will be the same logic as OUT1 and OUT2.

    Thanks,

    Michael

  • 0 in reply to Michael Arrant
    TI__Intellectual 2145 points

    Hi Michael

    Thanks for your reply. Few more questions about OCP and GVDD supply.

    Base on the DRV8300 block diagram GVDD will directly supply the internal gate driver without any voltage regulation.

    Any specific requirement for this GVDD power supply? (voltage level? voltage accuracy? voltage ripple?)

    In the meantime, we planning to use external OP AMPS+ comparater to achieve OCP and stall protection feature.

    What's your reommend method to shut down the gate driver output when overcurrent even happen?

  • 0 in reply to Gabriel Xu
    TI__Expert 3535 points

    Hi Gabriel,

    Yes GVDD will directly supply the internal gate driver as long as long as GVDD doesn't fall under GVDDUV.

    We recommend operating with GVDD with a minimum of 4.7V and a maximum of 21.5V.

    I think that if you detect an overcurrent event it would be a good idea to stop PWM the inputs. This device doesn't have any SPI communication so you could use a microcontroller and whenever your comparator goes high, you could stop PWM the inputs. 

    Thanks,

    Michael

  • 0 in reply to Michael Arrant
    TI__Intellectual 2145 points

    Michael

    As DRV8300 didn't have any shut down function for the gate driver so OCP protection could only execute by MCU?

    So it will be a software overcurrent protection and I afraid the respond time will be too long. 

    One more question, what's the purpose and functionality of high-side sensing pin? (SHA/SHB/SHC)?

  • 0 in reply to Gabriel Xu
    TI__Expert 3535 points

    Hi,

    That's a good point, there could be a longer than desired response time depending on the application. Since this is a very simple device, and does not have SPI, I'm not sure what else to suggest other than a MCU. To your question, SHx needs to be tied to the motor windings, as this is how the coil windings get energized to make the motor spin. 

    We have other devices in the drv8x family that you may be interested in if DRV8300 doesn't suite your needs. 

    Thanks,

    Michael

  • 0 in reply to Michael Arrant
    TI__Intellectual 2145 points

    Understood. Thanks for your help.

  • 0 in reply to Gabriel Xu
    TI__Expert 3535 points

    Best of luck, I will close this thread now.

    Thanks,

    Michael