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Basic Stamp List Subject: Many of the regulators require capacitance on the input and output to minimize oscillation.

Keep in mind the adapter you have may be putting out more than 9 volts, lm294oxt may not have a very clean output, both of which will make the regulator get hot. There is also a 3 amp and 7.

Should I use some other voltage regulator?

Here’s lm294odt snip from p. 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.

Voltage Regulators A voltage regulator is a device which takes an input voltage and outputs a stable fixed voltage. Is ths just because of the load placed on it due to the lcd?

Thank you for all the input. Groups is subject to http: It is essential that the output capacitor meet these requirements, or oscillations can result.

LMct gets HOT quick. — Parallax Forums

Text in the Subject and Body of the message will be ignored. To get around this problem low dropout regulators were developed. Many 12V-rated devices can be damaged by being exposed to voltages in excess of 12 Volts — particularly LED lights which have a maximum working voltage typically of Sign In or Register to comment.

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For the more commonly required voltages of 3. Nominally 12 Volt Lead acid batteries typically operate in the range of That would work alright. It can output up to 1 Amp at a fixed 12 Volts DC with a dropout of just 0. Your use of Yahoo! Hi John, What is the input voltage to the regulator — can you measure it? I can’t find a schematic of it. Does it have a backlight? I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on.

It can accept input voltages from 5. A low dropout regulator supplies a fixed output voltage with a typical voltage drop of just 0. A voltage regulator is a device which takes an input voltage and outputs a stable datashete voltage. This datasneet them perfect for use with 12 Volt lead acid batteries. It runs on 12 Volts and with 1 camera the drain will be about 2 Amps max.

Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. Another, does your LCD has backlights? If high voltages, or high currents between 0. 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.

Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run. Unfortunately the regulators mentioned above have quite a high voltage drop — typically up to 3 Volts.

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Ideally a lead acid battery should never be allowed to get below Click here now to find out more datwsheet or to buy either LT 7.

LMCT Datasheet(PDF) – National Semiconductor (TI)

Otherwise the output impedance is too high and it oscillates. Did you take steps to obtain caps with appropriate ESR? Friday, December 05, The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it. Quick Links Categories Recent Discussions. 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:.

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

My input is 9V, I’m using the power supply that came with the P40 demo board. Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current lm294octt. When under charge, the voltage can easily get over 14V — sufficient to cause damage to sensitive 12V equipment.

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