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LM258D Datasheet

Feb 16, 1. Feb 6, 2.

I have an original circuits as follows: View attachment Figure 3 flyback circuit provides power input for the circuit in Figure 2 Datashedt I measured the pin 7 output at its original circuit in Figure 1, its output is dc voltage around After I modified the circuits, which Q1 was replaced with 47K resistor and I put diode between pin 7 and the base of Q3. The output was as follows.

View attachment Figure 4 Modified circuit Here is the modified circuit output, which is not my expectation. View attachment Why does its datasheet perform like this way, not dc voltage output? How does this happen? I don’t know if this saturated and the top was cut since this is very big output gain. LMD Datasheet is attached.


Thank you for your help. Feb 16, 2. Nov 23, 8, 6, So, each valley is about 66 microSeconds apart at 15kHz. That means, according to my calibrated eye, the valley is about 25 microsecond wide. That means 13 microSeconds going down and 13 microseconds going up.

The datasheet says the slew rate is 0. So, let’s take 13 microseconds 0.

Looking at your o-scope output, my calibrated eye is fairly accurate and the datasheet is exactly right. You need a ml258d Pwm frequency or a faster op amp.

Note that low power devices are usually slow speed devices.

Feb 16, 3. Aug 1, 7, 2, Why did you replace an emitter-follower pull up device with a 47K resistor? This is a very large increase in output impedance, datasehet introduces a phase shift and low pass filter into the second opamp’s feedback loop.

Also, what is the function of Q2 in this circuit?

can anyone tell me why the waveform come out like this way not dc voltage | All About Circuits

Feb 18, 4. Posted by sarkarnov in forum: Can anyone tell me why the waveform is lean towards datssheet back? Posted by Faizan Ahmad in forum: Posted by rezash in forum: Can anyone tell me what this cable assy is for?


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