• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 336 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV595: UNexpected Fault mode-

ajayt
Genius 9555 points
Part Number: DRV595

HI Team, see attachment- we are also wondering the data sheet impiles that the input pins are biased at 3V  ( says biased rathre then bias) and also 

DIFFERENTIAL OR SINGLE-ENDED INPUTS The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel. To use the DRV595 with a differential source, connect the positive lead of the signal source to the IN+ input and the negative lead of the signal source to the IN– input. To use the DRV595 with a single-ended source, use a voltage divider to bias IN- to 3.0V, and apply the single-ended signal to IN.I have a DRV595 in a known working circuit.docx

  • 0
    TI__Mastermind 23240 points

    Hi Ajayt,

    This working circuit hasn't seen these issues that they have found with these 10 new boards. Was this problem seen on all of the new boards? Have they taken a look to make sure that the boards themselves weren't the issue? 

  • 0 in reply to Robert Clifton56
    TI__Genius 9555 points

    Hi 

    There is of course a possibility of that.

     

    But I have probed around to ensure that what I am expecting on all the pins in terms of voltage levels, shorts and open circuits are as they should be and also compared with a working board. No difference could be found.

     

    The question is in the first instance, if somebody could look at the circuit and ensure that the circuit is valid and should work. I am just worried about a tolerance that I have exceeded in this particular batch which may be casing the failure? I am wondering if the 2 inputs are being used correctly with the 0.8V on IN- and the variable input on IN+ (0V to 1.6V).


  • 0 in reply to ajayt
    TI__Mastermind 23240 points

    Hi Ajayt,

    Sorry for the delay in response. Does this fault report happen immediately when the device gets powered on? Is it possible to probe the output to see if the output's immediately go in to high impedance or if there's some switching right before this happens?

    Regards,

    Robert Clifton