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LM324-N OP-AMP Technology Review Request.

BJ Han
Expert 2035 points
Other Parts Discussed in Thread: LM324-N, LM324

Dear TI engineer.

I have a few questions.

1. If the surface temperature of the LM324N of 61 ℃ (@ ambient temperature of 24 ℃), can I see that the LM324-N is normal behavior?

2. Do you have a guide that will be sure how much (Absolute Maximum Ratings) ?

3. What if you use both the tying Output 4 channels of LM324-N to allow the current upper limit is how much?

4. Is the TI technical proposal to lower the surface temperature of the LM324-N?

  • 0
    TI__Guru 53626 points
    Hello BJ,

    This is not the proper way to parallel amplifier outputs. They will "fight" each other depending on their own offset.

    Please see the following Blog:

    e2e.ti.com/.../paralleling-op-amps-is-it-possible

    Each should have it's own output "ballast" resistor. If DC accuracy is needed, all the outputs should be placed under an overall feedback loop (as shown above).

    How much output current are you expecting to supply?? This is important.

    You are dropping a lot of voltage across the amplifier (24-3.3=20.7V). This is all going to end up as heat. Is it possible to use a lower amplifier supply voltage? Or a pre-regulator?

    Note that the LM324 is a low power amplifier and is not designed for high power applications. The package is not optimized to dissipate heat.

    Op-Amps are not designed to be system regulators. There may be stability issues if there are any bypass capacitors on the 3.3V supply line.

    The Absolute Maximum Ratings table (pg4, table 6.1) specified the maximum power dissipation and junction temperatures.

    Regards,
  • 0 in reply to Paul Grohe
    Expert 2035 points

    Hi Paul,

    Thank you for your attention and support.

    1. output current is 60mA

    2. This is LM324 output load Schematic.

    => 24DC input voltage is supplied and supply the current to the constant.

    3. Please let me know. Recommend is lower amplifier supply voltage.