LM2903N PDF

LMN Texas Instruments Analog Comparators Low Power Low Offset Voltage Dual Comparator 8-PDIP to 85 datasheet, inventory, & pricing. LMMX/NOPB. ACTIVE. SOIC. D. 8. Green (RoHS. & no Sb/Br). CU SN . LevelC-UNLIM. to LM. M. LMN/NOPB. ACTIVE. PDIP. Features: Single Supply Operation: 2 V to 36 V; Dual Supply Operation: ±1 V to ± 18 V; Allow Comparison of Voltages Near Ground Potential; Low Current Drain.

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Left click on the graphic to make it go full-screen and, by the way, here’s the LTspice circuit list just in case you want to play with the circuit s:. You need to add a pull-up resistor of about 10k between the output pin and your positive supply rail.

I looked over the datasheet for 3 days and didn’t see the typical application. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Pm2903n Questions Tags Users Unanswered. Post as a guest Name. Just for grins – since you want to learn about comparators – it might be fun to take a look at the two circuits below and figure out why VOUT2 switches and VOUT1 doesn’t, even though VIN is the same input to both circuits. After I get my desired voltage out of my Comparator, how do I stabilize it so that Lm29003n can use it on a load?

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Also, thanks for the 10K resistor idea that got the voltage down to what I was hoping to see. Thank you for pointing this out and I will go back over the datasheet to get a better understanding of how to read it. Can anyone help me come up with ideas to try and get this working?

However, when I check the output the resulting voltage is 0v. You’ll never get 0V out with GND equal to zero volts, no matter what, because of the saturation resistance of the comparator’s output transistor.

Why is this happening. Since your original question has been dealt with to your satisfaction, it’s done with. Sign up or log in Sign up using Google. In general, inputs come from the left and the top of the drawing, and outputs go out the bottom and the right, kinda like this, after adding the pullup to the comparator’s output: Sign up using Email and Password.

I will look into your question. Matthew Tubbs 5 1. I mistakenly thought the inverted its output. Sign up using Facebook. Comparator help LmN Ask Question. In general, inputs come from the left and the pm2903n of the drawing, and outputs go out the bottom and the right, kinda like this, after adding the pullup to the comparator’s output:.

You need a pullup resistor. You might want to try making your drawings easier to read, since that makes it much easier for us to follow the circuit’s ins and outs.

Can you describe what you mean by “invert the inputs” by editing your question, please? Unfortunately, that ohm pullup I showed is more than likely causing the problem, and it should be more like 10k for an LM The LM has an open collector output so it can not actively drive a positive voltage. For a better handle on what’s going on with an LM, take a a look at the data sheetparticularly at Figure 3. Thanks for the drawings. One more question thought please?

After testing the pull up resistor, I am left wondering when I invert the inputs I do not get 0v like I was expecting.

I am using a LMN to learn about comparators. The horn is about 15 ohms. The LM has an open-collector output. If you have a new question relating to a car horn, you should ask it separately.

My ln2903n diagram looks similar to this picture I created in LTspice. Left click on the graphic to make it go full-screen and, by the way, here’s the LTspice circuit list just in case you want to play with the circuit s: By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Comparator help (LmN) – Electrical Engineering Stack Exchange

Reading the datasheet would have quickly cleared this up, there’s even a nice “typical application” schematic. They helped a lot. Say I want to use the 12v Vout to make my horn go off on my car.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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