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Refrigerator fan motor drive solution

Yue TANG
Expert 8515 points
Other Parts Discussed in Thread: DRV10970, DRV10970EVM, DRV8876, DRV8847

Hi.

My customer asked for a solution  to meet below requirement, please help to provide your suggestion, thanks. 

1. the refrigerator fan motor is an unidirectional PWM motor, 1650 rpm, rated power is 1.35W

2.open loop control， support position feedback

3.Using PWM to control the speed (20% to 100%)

4.Speed accuracy: ± 4%, speed fluctuation: ＜ 10rpm

  • 0
    TI__Mastermind 24405 points

    Hi Yue,

    Thanks for posting your question in MD forum. Looking at the specifications, I think DRV10970 will be a good choice for this application. DRV10970 is an integrated three-phase BLDC motor driver which can be used for refrigerator fan. Also, DRV10970 is designed for either differential or single-ended Hall sensor based applications. Please refer to DRV10970 Datasheet for more information. We also provide EVM for DRV10970. Please check DRV10970EVM for users guide and other technical documents.Please let me know if you have any questions related to this device.

    Regards,

    Vishnu

  • 0 in reply to Vishnu Balaraj
    TI__Expert 8515 points

    Vishnu,

    Thanks for the recommendation. but per checked with customer, it is not a BLDC motor, it is a BDC motor. would you  please recommend device for this type of motor?

  • 0 in reply to Yue TANG
    TI__Mastermind 24405 points

    Hi Yue,

    Thanks for the confirmation. An expert from BDC group will get back to you on this. Thanks.

    Regards,

    Vishnu

  • 0 in reply to Vishnu Balaraj
    TI__Mastermind 37683 points

    Hi Yue,

    I recommend two devices, the DRV8876 and the DRV8847. Below is some information about each one:

    DRV8847:

    • 0.65 1ku price
    • PWM control
    • dual H-bridge
    • current sensing
    • open-load detection
    • Vmin=2.7V; Vmax=18V
    • Peak output currrent=2A
    • integrated charge pump (no external charge pump capacitors required)

    DRV8876:

    • 0.68 1ku price
    • single H-bridge
    • PWM and PH/EN control
    • integrated current sensing
    • Vmin=4.5V; Vmax=37V
    • Peak output currrent=3.5A;

    The DRV8847 is the cheaper solution but has lower Vmin, Vmax, and output current ratings. The DRV8847 does not require external capacitors for the charge pump which can save space on the PCB.On the other hand, the DRV8876 is more expensive but contains for safety features and has higher current and voltage ratings. The DRV8876 requires external capacitors for the charge pump. You can read more about each device on the datasheets and decide which one is best for your application and specs. Let me know if you have further questions. 

  • 0 in reply to Pablo Armet
    TI__Expert 8515 points

    Pablo,

    Thanks for recommendation.do these devies support position feedback?

  • 0 in reply to Yue TANG
    TI__Mastermind 37683 points

    Yue,

    If you have an external position monitoring device like hall sensor or encoder, you can read the data from those devices with an MCU and control the driver based on the data thus create a position feedback loop. The devices themselves do not have any internal position monitoring circuitry.