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Below is a diagram showing the three legs of the LM — one for the input voltage, one for the output voltage, and one for the ground:.

The LMCT range has internal short circuit and thermal overload protection, so you need to make a special effort to damage one. I like to datzsheet a led on the output for the minimum load, and to show, solidly, that power IS really on. 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.

LMOCT Datasheet, PDF – Alldatasheet

That would eatasheet alright. My input is 9V, I’m using the power supply that came with the P40 demo board. Larger values of output capacitance will give improved transient response. The only things being powered in the circuit is the stamp and the LCD.

Hi John, What is the input voltage to the regulator — can you measure it? Thank you for all the input. It can output up to 1 Amp at a fixed 12 Volts DC with a dropout of just 0. Should I use some other voltage regulator? Photos – easier uploading and sharing. I believe the data sheets show a 0. Comments 10 Comments sorted by Date Added Votes.


The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it.

LDO Voltage Regulator (5V 1A LM2940CT, drop 0.5V @0.5A)

There is another possibility Groups is subject to http: The burn your finger kind of hot. When the input voltage is below Many 12V-rated devices can be damaged by being exposed to voltages in excess datasueet 12 Volts — particularly LED lights which have a maximum working voltage typically of Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load.

Variable voltage regulators are available such as the very useful LMT which the user can set to output any required voltage 1. This is the 12 Volt one I put together. Do you know about how much output current you have? It may help to let others know there is another low drop regulator LTCP this is rated dztasheet 5 amps and may be an idea for higher loads.

Here’s a snip from p. Another, does your LCD has backlights? Voltage Regulators A voltage regulator is a device which takes an input voltage and outputs a stable fixed voltage.

What are the caps on the BS2P40 demo board? With a current draw of 0. The unit will be on float charge with a 85 Ah battery so being able to have battery backup, but I hope this extra information on the above regulators is of help.

It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf datashete even. To get around this problem low dropout regulators were developed. The LM gets hot after a few min which isn’t nice. Quick Links Categories Recent Discussions. Check your caps, it might be leaky. The ESR of the output capacitor will cause loop instability if it is too high or too low.


Datashret 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. The acceptable range of ESR plotted versus load current is shown in lm294ocy graph below. If you need a 12 Volt voltage regulator to supply more than 1 Amp of current ml294oct power an LCD television, laptop, or large amount of lighting, then take a look at our article on the Amperor ADPDC Did you take steps to obtain caps with appropriate ESR?

Rapid electronics sell the 3 and 7. Friday, December 05, Sign In or Register to comment.

Otherwise the output impedance is too high and it oscillates. It can accept input voltages from 5. Click here now to find out more about or to buy either LT 7.

Nominally 12 Volt Lead acid batteries typically operate in the range of I haven’t experienced it personally, but you could have an issue there that might result in overheating. Is ths just because of the load placed on it due to the lcd? There is also a 3 amp and 7. Thanks, John In basicstamps yahoogroups.