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DRV411 output issue

Gump
Intellectual 490 points
Other Parts Discussed in Thread: DRV411

DRV411 is used for a few years ,but recently a direct output of 5V happened when power on. what is the probable cause ?

  • 0
    TI__Mastermind 26475 points
    Hello Gan,

    I will attempt to get the correct person to look into this issue. Please excuse the delay as today is a holiday in the US.

    Regards,
    Javier
  • 0
    TI__Prodigy 50 points

    Hello Gan Wei,

    Typically an error condition in the DRV411 can cause the output to hit the rail upon powering up. This can be found if either the ERROR pin or the OR pin are pulled low. You may have to connect a pull-up resistor to these pins to check the signal levels. Some possible error cases are:

    1. Hall sensor not working/damaged - replace Hall sensor and try again
    2. Hall sensor connection broken - check wires to see if connection is broken
    3. The diffamp is overloaded - possibly due to input overload. Check voltage across the shunt resistor. If that exceeds 0.625V, then the diffamp is overloaded.
    4. If the voltage across the shunt resistor is greater than 0.625V, then it could be due to error conditions mentioned in 1 & 2, or that the secondary winding has a short somewhere leading to a smaller than expected load impedance.

    If none of the above is true, then please send us a screenshot of the power-up behavior with the following signals:

    • Supply
    • iComp1 & iComp2
    • Vout
    • If possible, voltage at the Hall sensor pins.

    Also, does problem occur with just one module, or several modules? Could you share the schematics with us?

    Thanks and regards,

    Sudarshan

  • 0 in reply to Sudarshan
    Intellectual 490 points

    Dear Sudarshan，

    Thank you very much! Add some information as below before further test: 

    1、The schematic is following Figure 56 in DRV411 datasheet and check by TI, which is used in the past 4 years;

    2、The output hit the rail even though without input (Ip in Figure 56);

    3、300pcs of 8000 modules do not work well, and more than 70% in these 300pcs occur this problem;

    4、Replace a falling device with a new one resolve this problem;

    5、The PCB has X-ray detection to  exclude soldering problem;

  • 0 in reply to Gump
    TI__Prodigy 50 points

    Dear Gan Wei,

    If you have followed  the debug steps I mentioned in the previous post, and believe the problem is with the DRV411 ICs, then you may initiate a return process for the failing ICs for a quick analysis of the issue. The process is defined at the link below:

    http://www.ti.com/lsds/ti/quality/resources/customer_returns.page

    If you purchased the DRV411 parts through a distributor, TI requires that you work through the distributor in order to return the material to TI. If you have more technical issues, then I will be glad to help you.

    Thanks and regards,

    Sudarshan