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I believe the data sheets show a 0. Click here now to find out more about or to buy either LT 7.

What are the caps on the BS2P40 demo board? I like to put a led on the datssheet for the minimum load, and to show, solidly, that power IS really on. Sign In or Register to comment.

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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:. Text in the Subject and Body of the message will be ignored. To get around this problem low dropout regulators were developed.

LMct gets HOT quick. — Parallax Forums

Here’s a snip from p. If high voltages, or high currents between 0. Nominally 12 Volt Lead acid batteries typically operate in the range of Otherwise the output impedance is too high and it oscillates. My input is 9V, I’m using the power supply that came with the P40 demo board. A voltage regulator is a device which takes an input voltage and outputs a stable fixed voltage.

If you need a low dropout voltage regulator which can be adjusted to give a non-standard voltage in the range 5 to 15 Volts DCclick here to read our new article LM 1 Amp Low Dropout Adjustable Regulator.


Comments 10 Comments sorted by Date Added Datasjeet. Photos – easier uploading and sharing. Variable voltage regulators are available such as the very useful LMT which the user can set to output any required voltage 1.

LMCT-9 datasheet & applicatoin notes – Datasheet Archive

Quick Links Categories Recent Discussions. There is another possibility Unfortunately the regulators mentioned above have quite a high voltage drop — typically up to 3 Volts.

Groups is subject to http: Did you take steps to obtain caps with appropriate ESR? It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even.

It is essential that the output capacitor meet these requirements, or oscillations can result. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run. The burn your finger kind of hot. Thank you for all the input. When under charge, the voltage can easily get over 14V — sufficient to cause damage to sensitive 12V equipment.

The LM gets hot after a few min which isn’t nice. Is ths just because of the load placed on it due to the lcd?

1A Low Dropout Regulator

The power datashfet Watts being dissipated within the regulator is the voltage drop lm294occt the regulator times the current passing through it. Click here to view these low drop out regulators now.

Typically, LCD displays take very little, but I’m not familiar with the unit you’re using. Hi John, What is the input voltage to the regulator — can you measure it? Hello, All I have is a cap between the output and ground at 22uf. Basic Stamp List Subject: The ESR of the output capacitor will cause loop dtasheet if it is too high or too low.

  ASTM C1172 PDF

The acceptable range of ESR plotted versus load current is shown in the graph below. It can output up to 1 Amp at a fixed 12 Volts DC with a dropout of just 0. Voltage Regulators A voltage regulator is a device which takes an input voltage and outputs a stable fixed voltage.

It may help to let dwtasheet know there dtasheet another low drop regulator LTCP this is rated at 5 amps and may be an idea for higher loads. 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. Larger values of output capacitance will give improved transient response. A low dropout regulator supplies a fixed output voltage with a typical voltage drop of just 0. It can accept input voltages from 5.

That would work alright. I haven’t experienced it personally, but you could have an issue there that might result in overheating.

The LMCT range has internal short circuit and thermal overload protection, so you need to make a special effort to damage one. Another, does your LCD has backlights? Many of the regulators require capacitance on the input and output datasgeet minimize oscillation.

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