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DRV8873: Regarding the starting current management on the IC

Shiraz Hussain
Prodigy 140 points
Part Number: DRV8873

We want to drive a BDC motor from Anaheim (BDC-168-R-24-3500-S-CB-W6) which drive IC is best suited for this device.

We came across this part http://www.ti.com/lit/ds/symlink/drv8873.pdf which has peak current drive capability of 10A.

>How does the IC manage the starting current for the motor is it inherently controlled by the IC or we have send the command for that also (for softstart of the motor).

> Any TI IC capable of higher current for example 15A or so. The rated current for this motor is 11A.

> Do you have suggestions of ICs without integrated half bridge (only with pins for gate pulse generation and protections).

Thank you

Shiraz Hussain

  • 0
    TI__Expert 8985 points

    Hi Shiraz,

    Answers to your questions inline. Thank you:

    >How does the IC manage the starting current for the motor is it inherently controlled by the IC or we have send the command for that also (for softstart of the motor).

    -> The drivers manage the startup current from being too high is by utilizing either an external sense resistor or an integrated current sensing solution. You can read and watch more on the following resources:

    > Any TI IC capable of higher current for example 15A or so. The rated current for this motor is 11A.

    -> For an integrated FET, Brushed DC driving solution, the DRV8432 can achieve up to 14-A continuous current in Parallel Mode (24-A peak).

    > Do you have suggestions of ICs without integrated half bridge (only with pins for gate pulse generation and protections).

    ->In this case, we have numerous solutions, as the motor driver itself now watches the voltages across the FETs on the external half/H bridges to monitor for protection. The current limit is set by the external FET stage design.

    One example for your to consider is the DRV8703-Q1, which has an EVM, DRV8703-Q1EVM, designed to work at up to 15-A continuous current (20-A peaks).