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DRV8411: spec check

GARETH OU
Guru 10615 points
Part Number: DRV8411
Other Parts Discussed in Thread: DRV8436, DRV8428, DRV8425, DRV8847, DRV8849, DRV8845

Tool/software:

Hi 

For the 12V stepper motor in the attached file, is there an integrated driver IC or a recommended alternative?

stepping motor.pdf

  • 0
    TI__Mastermind 32385 points

    Hi Gareth,

    Thank you for your post.

    Based on the datasheet the stepper motor is a bipolar stepper motor with ~ 150 mA coil current (12 V / 80 Ω). The DRV8411 can drive this stepper especially when either full-step or half-step mode driving is sufficient. Even for this drive the controller MCU must provide the indexer sequencing.

    Usually using a stepper driver with integrated indexer with STEP/DIR interface would be more convenient and less demanding for the controlling MCU. Example drivers would be DRV8428, DRV8436, DRV8425 etc. 

    Regards, Murugavel  

  • 0 in reply to Murugavel4637
    Guru 10615 points

    Murugavel  

    Customer considerations DRV8428PWPR and DRV8847 Please help me confirm whether the DRV8847 specifications can be met

    In addition, I would like to ask, the customer has two 5V DC motors, which control lens zoom and focus respectively. The DVR8847 specification sheet mentions that it has low on-resistance when VM > 5V – when TA = 25°C, RDS(ON) (HS + LS ) is 1000mΩ, which means that when we use 5V power supply, this IC will be hotter, right?

    Thank you

  • 0 in reply to GARETH OU
    TI__Mastermind 32385 points

    Hi Gareth,

    GARETH OU said:
    Customer considerations DRV8428PWPR and DRV8847 Please help me confirm whether the DRV8847 specifications can be met

    Customer stepper motor current is ~150 mA. So both devices can drive this motor with no issues from a current drive standpoint. The DRV8428 has integrated microstepping indexer while the DRV8847 requires external MCU indexer. 

    GARETH OU said:
    n addition, I would like to ask, the customer has two 5V DC motors, which control lens zoom and focus respectively. The DVR8847 specification sheet mentions that it has low on-resistance when VM > 5V – when TA = 25°C, RDS(ON) (HS + LS ) is 1000mΩ, which means that when we use 5V power supply, this IC will be hotter, right?

    Those were the test condition under which the Rdson was measured. Usually Rdson increases with temperature not so much with the voltage. Especially with 150 mA motor current power dissipation may not be that high. So, the Rdson change with voltage at the same temperature would be negligible. 

    GARETH OU said:
    the customer has two 5V DC motors, which control lens zoom and focus respectively.

    Customer could also consider the DRV8849 which is a dual stepper driver with integrated indexer or the DRV8845 which is a dual stepper driver with external MCU indexer. Have you looked at these devices? Thank you.

    Regards, Murugavel