LM2940CT 5.0 PDF


Package. 0˚C ≤ TJ ≤ ˚C LMCT LMCT LMCT LMCT TO LMCS LMCS The LMCT/NOPB is a positive Voltage Regulator features the ability to source 1A of output current with a dropout voltage of typically V and a. Pin 5 and 6 need to be tied together on PCB board (5) ESD rating is based on the human body model, pF discharged through LMCT/NOPB.

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Do you know about how much output current you have? The only things being powered in .50 circuit is the stamp and the LCD.

Here’s a snip from p.

LM2940ct 5.0 gets HOT quick.

ml2940ct Quick Links Categories Recent Discussions. Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load.

I can’t find a schematic of it. Photos – easier uploading and sharing. I will try it with the additional cap. The burn your finger kind of hot. What are 50 caps on the BS2P40 demo board? Larger values of output capacitance will give improved transient response. Friday, December 05, I have a 22uf cap between the output and ground as specified in the datasheet for stability.


LDO – LM2940CT-5.0

It is essential that the output capacitor meet these requirements, or oscillations can result. It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even. I believe the data sheets show a 0. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.

The quiescent current with 1A of output current lm2940ch an input-output differential of 5V is therefore only 30 mA. JavaScript seems to be disabled in your lmm2940ct.

Hi John, What is the input voltage to the regulator — can you measure it? I haven’t experienced it personally, but you could have an issue there that might result in overheating.

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Check your caps, it might be leaky. Guess you like Empty. I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on.

LMct gets HOT quick. — Parallax Forums

My input is 9V, I’m using the power supply that came with the P40 demo board. Should I use some other voltage regulator? Thank you for all the input. The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it. Familiar regulator features such as short circuit and thermal overload protection are also provided. I accept the Terms and Coditions. Many of the regulators require capacitance on the input and output to minimize oscillation.


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During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating volt-age, the regulator will automatically shut down to protect both the internal circuits and the load. That would work alright. First name is required!

The acceptable range of ESR plotted versus load current is shown in the graph below. Otherwise the output impedance is too high and it oscillates. Groups is subject to http: Sign In or Register to comment. Typically, 5.00 displays take very little, but I’m not familiar with the unit you’re using. Be the first one to review this product.

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