• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 48 subscribers
  • Views 705 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.

About the cause of breakage of TLV2374.

Satoshi
Guru 19485 points
Other Parts Discussed in Thread: TLV2374

1205.TLV2374IPWR.pdf

Although the customer is estimating TLV2374, breakage takes place and it is checking the cause.

The cause considered to be a circuit diagram was written to attachment.

If there is a cause otherwise considered, please let me know.
 
[Supplementary information]
・A power supply uses a stabilized power supply.
It wired by a 1m cable, and circuits of TLV2374(s) have connected by 40cm wiring again,

after passing along the capacitor bank of 2200uF.


・Although the power supply is usually stable, if the temperature controller for an examination is used,

the random noise of about a maximum of 200 mVP-P will occur.


⇒The same noise comes out with amplitude also with a comparable output (1pin and 7pins) of TLV2374.
Is an oscillation excited by this random noise and is a device damaged?

Thank you for your consideration.

  • 0
    Guru 19485 points

    How is a situation about the affair asked the other day?
     
    If it is sometimes checked with a customer in order to issue a reply, please let me know.

    Besr Regards,

    Satoshi

  • 0 in reply to Satoshi
    Guru 19485 points

    From a customer, when they wanted the early reply, there was a request.

    I became hurry and, excuse me, please advise me.

    Satoshi

  • 0 in reply to Satoshi
    Expert 1495 points

    Hi,

    I don't understand why U39 is powered between P5 & LG, and U40 between LG & N5.

    You may try powering both U39 & U40between P5 & N5.

    Regards,

    Jayant

  • 0 in reply to Jayant Deshpande
    Guru 19485 points

    Dear Jayant-san

    Thank you for the advice.

    With the power supply I asked him to teach, I proposes to a customer.

    Moreover, the customer was also looking for the cause.

    The circuit diagram which expanded U39 and U40 is attached.
    (The present condition is the 1st page and proposed measures are the 2nd page)

    The customer considers the following to be a failure factor.
    1. Oscillation from which external circuit noise becomes source of excitation.

    It became clear that the power supply line of the input terminal of TLV2374 and other circuits had joined together through Via-Hole.

    The oscillation is excited by pulse operation of the power supply line.
     
    At this time, there were frequency of 10～100kHz and voltage with an amplitude of about ±300mV in the input terminal(-) of the 2nd step of TLV2734.

    Owing to the above, it broke down exceeding the Absolute Maximum rating of an input terminal.

    2. About the injection of an external power source, if +5V rises ahead of -5V, the voltage of +500mV will be impressed to the input terminal(-) of the 2nd step of TLV2374.

    By the bottom cause of the above, it broke down exceeding Absolute Maximum rating of an input terminal.

    As a remedy of the above-mentioned two factors, addition of a capacitor and a Schottky barrier diode is considered like the 2nd ppt-slide.

    Then, please let me know two below.
    1. Is it Right although it is Surmising that it Breaks Down by the Two Above-mentioned Factors?
    2. Does Addition of a Circuit Element like the 2nd ppt-Slide Generate Another Trouble?

    6406.TLV2374_140422.pptx

    Best regards,

    Satoshi

  • 0 in reply to Satoshi
    Expert 1495 points

    Dear Satoshi-san,

    Just to clarify, changes to power supply connections documented in slide 3.

    0647.TLV2374_140423.ppt

    Best Regards,

    Jayant