LMCT/NOPB Texas Instruments LDO Voltage Regulators 1A LDO REG datasheet, inventory, & pricing. 1A LDO REG. Datasheet: . Documents (5). Low drop-out voltage regulator. Order code. Manufacturer code. Description. LMCT LMCT-5 1A REGULATOR (RC). LMCT-5 -. The LM/LMC positive voltage regulator features the ability to source 1A of output current with a dropout voltage of typically V and a .

Author: Morisar Malagrel
Country: Vietnam
Language: English (Spanish)
Genre: History
Published (Last): 27 June 2007
Pages: 188
PDF File Size: 20.28 Mb
ePub File Size: 11.36 Mb
ISBN: 251-2-31757-506-4
Downloads: 23274
Price: Free* [*Free Regsitration Required]
Uploader: Gutilar

The LM gets hot after a few min which isn’t nice. Regards, -Bruce tech at rentron. What are the caps on the BS2P40 demo board? Check datasheet for correct smoothing and decoupling capacitance values. Keep in mind the adapter you have may be putting out more than 9 volts, or may not have lm29400ct-5 very clean output, both of which will make the regulator get hot.

The only things being powered in the circuit is the stamp and the LCD. That would work alright. Any ideas why is dayasheet working with the LMCT5?

LM2940CT-5 PDF Datasheet浏览和下载

I will try it with the additional cap. Basic Stamp List Subject: I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on. I couldn’t find a datasheet for the LMCT5, but, some LDO types require specific capacitor values on the output or they will oscillate, and that causes major problems. Groups is subject to http: I cannot find out why lm2940cr-5 not working.


LMCT-5 Datasheet

If too little or none they can oscillate which may not show on your meter? My input is 9V, I’m using the power supply that came with the P40 demo board. Another, does your LCD has backlights? Typically, Daatasheet displays take very little, but I’m not familiar with the unit you’re using.

Just in case, tried another one, nothing happened.

The ESR of the output capacitor will cause loop instability if it is too high or too low. Photos – easier uploading and sharing. Join Date Jul Posts 2, The acceptable range of ESR plotted versus load current is shown in the graph below. The time now is Do you know about how much output current dafasheet have?

LM2940ct 5.0 gets HOT quick.

I haven’t experienced it personally, but you could have an issue there that might result in overheating. Thanks, John In lm2940ct-55 yahoogroups. Hi John, What is the input voltage to the regulator — can you measure it? Another data sheet says 0. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.

Is ths just because of the load placed on it due to the lcd? Did you take steps to obtain caps with appropriate ESR? Friday, December 05, Bob Edit oops Bruce has just giving this info. Does it have a backlight?


Hi danielhr77, Make sure you have enough capacitance fitted lm2940c-5 before and after the regulator. 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.

LMct gets HOT quick. — Parallax Forums

Results 1 to 5 of lm2940t-5. Your use of Yahoo! Otherwise the output impedance is too high and it oscillates. I switched back to the and everything worked again!!! I found a data sheet on the LM, and it looks like you need at least 22uF on the output, and drop-out will be around lm2940cr-5. I believe the data sheets show a 0. Thank you for all the input.

Similar Threads Program works fine alone but not as part of a larger program. Larger values of output capacitance will give improved transient response.

Check your caps, it might be leaky. The burn your finger kind of hot.

Let us know if this solves the problem? I thought that the LMCT5 was better than thebut is not. Sign In or Register to comment. Text in the Subject and Body of the message will be ignored.