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TLV2402: Output short circuit protection of amplifier

Gary Gravante
Prodigy 30 points
Part Number: TLV2402

Hi,

  We are using a TLV2402IDR in a battery balance circuit and VCC is connected to +12V and GND is connected to ground in our setup.  While testing the board, the amplifier was outputting +4V and when a tech probed the board to look at a signal, pin 8 (VCC) was shorted to pin 7 (OUT) momentarily.  I could not specifically find a mention of output short circuit protection for this device, so I am not sure if the part was stressed at all.  It appears to still be working fine, but we will replace it if there is any possibility of damage.  I have read that other amplifiers have protections such that any short to a voltage between VCC and ground is OK, but if you exceed VCC or GND there may be damage.

Thanks for any information,

Gary Gravante

  • 0
    TI__Prodigy 60 points
    Hi Gary,

    Please operate the amplifier within recommended operating conditions listed in the PDS for best performance and avoid exceeding Absolute Maximum ratings to avoid damage.

    Was this short that you describe due to the probe point tip shorting adjacent pins 7 and 8?

    As long as the Output current is limited to 10mA the part will be OK.
    I am checking to see if there is a specific short circuit protection circuitry on this part.

    thanks Tushar
  • 0 in reply to Tushar Jog
    Prodigy 30 points

    Hi Tushar,

      Yes, the tech touched pins 7 and 8, so that connected +12V to the output on pin 7.  It was not clear in the datasheet if that +12V supply, which can source several amps of current, would harm that output.

    Gary

  • 0 in reply to Gary Gravante
    TI__Mastermind 49896 points

    Hello Gary,

    This is a micro-power device. The datasheet curves show that the output has current limiting (Figs 11-16). Current limit is above 250uA.

    Damage usually occurs due to power dissipation (overheating of the die). 12V*250uA = 3mW. Shorting the output for a few seconds would not cause the die to heat up enough to do any damage.

     I would not expect it to do any damage - but you may replace the device if there are any doubts.

  • 0 in reply to Paul Grohe
    Prodigy 30 points

    Thank you Paul - I appreciate the information!  It was much less than 1 second, so I think we will be fine.

    Gary