LM324: Difference between LM324 and LM324A?

The LM324A has a smaller input offset voltage.

I do not know your circuit. Show your schematic.

The LM324A is a narrower selected version of LM324. The only difference is the smaller input offset voltage and smaller input bias current. That's all. The rest is manufacturing tolerances from wafer to wafer.

Kai

Hello User,

The application circuit requirements may be too great for the LM324 if there is a noticeable change between LM324 and LM324A. Can you give more details about your circuit?

Fyi, thanks for your support!

What you do is risky, because the LM324 introduces a considerable additional time delay and phase lag at the VSENSE pin of regulator. Many regulators become instable with such a circuit and need a modification of component values at the COMP pin.

What do you mean by

user5345709 said:

When using the same circuit, the output of  LM324   is smaller than that of LM324A.

That Vout_high is becoming smaller or Vout_low?

Me thinks that R21 plays an important role in your circuit. Have you tried to alter the resistance value to lower values?

Have you noticed that you might violate the common mode input voltage range of U53B?

Kai

User,

To get U53D out of the feedback loop, try change R20 to 4.12k , change R22 to 1k to lower impedance

Then remove D32 and R21. Then short pins 12 and 13 together to test this. (normally I'm not a fan of shorting inputs together)

LM324 has a wider Vos range and U53A has a gain of 100 , so input offset voltage could affect this output.