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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Furthermore, a lm2940vt current reduction circuit has been included which reduces the ground current when the differential between the input volt-age and the output voltage exceeds approximately 3V.
Guess you like Empty. Another data sheet says 0. Your use of Yahoo! Do you know about how much output current you have? I haven’t experienced it personally, but you could have an issue there that might result in overheating. I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on.
That would work alright. Hello, All I have is a cap between the output and ground at 22uf. Many of the regulators require capacitance on the input and output to minimize oscillation.
Here’s a snip from p. I have a 22uf cap between the output and ground as specified in the datasheet for stability. Check your caps, it might be leaky.
The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it. Text in the Subject and Body of the message will be ignored. Another, does your LCD has backlights?
LDO – LM2940CT-5.0
Write Your Own Review 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.
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 lm2490ct. If you aren’t running very much current, and your Vin isn’t too high, a small clip-on heat lm9240ct can significantly reduce the regulator’s temperature.
The only things being powered in the circuit is the stamp and the LCD. I will try it with the additional cap.
Email to a Friend. Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load.
LMCT/NOPB from Texas Instruments
It is essential that the output capacitor meet these requirements, or oscillations can result. Otherwise the output impedance is too high and it oscillates. Basic Stamp List Subject: I accept the Terms and Coditions. What are the caps on the BS2P40 demo board? It’s lm290ct that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even.
There is another possibility Thank you for all the input. Friday, December 05, Forgot Password Login or registration.
LM2940ct 5.0 gets HOT quick.
During line llm2940ct, 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.
Photos – easier uploading and sharing. I believe the data sheets show a 0. Please, log in or register. The burn your finger kind of hot. Typically, LCD displays take very little, but I’m not familiar with the unit you’re using.
Did you take steps to obtain caps with appropriate ESR? First name is required!