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.
|Published (Last):||10 March 2007|
|PDF File Size:||20.82 Mb|
|ePub File Size:||2.91 Mb|
|Price:||Free* [*Free Regsitration Required]|
I will try it with the lmm2940ct cap. I accept the Terms and Coditions. Larger values of output capacitance will give improved transient response. Thanks, John In basicstamps yahoogroups.
LDO – LM2940CT-5.0
The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. If you aren’t running very much current, and your Vin isn’t too high, a small clip-on heat sink can significantly reduce the regulator’s temperature.
The LM gets hot after a lm29400ct min which isn’t nice. First name is required! There is another possibility Furthermore, a quiescent 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. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.
Hi John, What is the input voltage to the regulator lj2940ct can you measure it? 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.
It is essential that the output capacitor meet these requirements, or oscillations can result.
LMCT/NOPB from Texas Instruments
Be the first one to review this product. Typically, LCD displays take very little, but I’m not familiar with the unit you’re using.
Hello, All I have is a cap between the output and ground at 22uf. Comments 10 Comments sorted by Date Added Votes. Did you take steps to obtain caps with appropriate ESR?
Another data sheet says 0. It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even. Email to a Friend.
LMCT/NOPB – Texas Instruments – PCB Footprint & Symbol Download
Write Your Own Review Only registered customers who has bought this product can write reviews. I can’t find a schematic of it. The ESR of the output capacitor will cause loop instability if lm2940cg is too high or too low. Groups is subject to http: My input is 9V, I’m using the power supply that came with the P40 demo board. Should I use some other voltage regulator? Many of the regulators require capacitance on the input and output to minimize oscillation.
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.
Thank you for all the input. Otherwise the output impedance is too high and it oscillates. Check your caps, it lm940ct be leaky. Do you know about how much output current you have? 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. Only registered customers who has bought this product can write reviews.
Is ths just because of the load placed on it due to the lcd?