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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LMct gets HOT quick. — Parallax Forums

Photos – easier uploading and sharing. Furthermore, a quiescent current l2m940ct circuit has been included which reduces the ground current when the differential between the input volt-age and the output voltage exceeds approximately 3V.

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Another data sheet says 0. Sign In or Register to comment.

Familiar regulator features such as short circuit and thermal overload protection are also provided. First name is required! Keep in mind the adapter you have may be putting out more than 9 volts, or may not have a very clean output, both of which will make the regulator get hot.

There is another possibility 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. Larger lm2940cg of output capacitance will give improved transient response.

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I can’t find a schematic of it. It is essential that the output capacitor meet these requirements, or oscillations can result. Here’s a snip from p. I accept the Terms and Coditions. Basic Stamp List Subject: Furthermore, hidden in the lm29400ct note the ones that I l2m940ct seen is an admonition to have a minimum current load. That would work alright. Please, log in or register.

Otherwise the output impedance is too high and it oscillates. JavaScript seems to be disabled in your browser. Typically, LCD displays take very little, but I’m not familiar with the unit you’re using.

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Does it have a backlight? The acceptable range of ESR plotted versus load current is shown in the graph below. I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on. I believe the data sheets show a 0.

LDO – LM2940CT-5.0

Another, does your LCD has backlights? The burn your finger kind of hot. Write Your Own Review Only registered customers who has bought this product can write reviews.

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Only registered customers who has bought this product can write reviews. The ESR of the output capacitor will cause loop instability if it is too high or too low. You must have JavaScript enabled in your browser to utilize the functionality of this website. The .50 current with 1A of output current and an input-output differential of 5V km2940ct therefore only 30 mA.

Forgot Password Login or registration. Hi John, What is the input voltage to the regulator — can you measure it?

LMCT/NOPB from Texas Instruments

Comments 10 Comments sorted by Date Added Votes. Did you take steps to obtain caps with appropriate ESR?

I have a lm2940cct cap between the output and ground as specified in the datasheet for stability. The LM gets hot after a few min which isn’t nice. Thanks, John In basicstamps yahoogroups.

Many of the regulators require capacitance on the input and output to minimize oscillation.

It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even.