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Hello, All I have is a cap between the output and ground at 22uf. The ESR of the output capacitor will cause loop instability if it is too dataxheet or too low.

LMCT-9 datasheet & applicatoin notes – Datasheet Archive

Friday, December 05, Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.

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 Furthermore, hidden in the ap note the ones that I have seen is an admonition to have a minimum current load.

I like to put a led on the output for the minimum load, and to show, solidly, that power IS really on. A low dropout regulator supplies a fixed output voltage with a typical voltage drop of just 0. Nominally 12 Volt Lead acid datassheet typically operate in the range of When the input voltage is below It may help to let others know there is another low drop regulator LTCP this is rated at 5 amps and datasheft be an idea for higher loads.


The acceptable range of ESR plotted versus load current is shown in dafasheet graph below. Your use of Yahoo!

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. 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.

Comments 10 Comments sorted by Date Added Votes.

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:. With a current draw of 0. What are the caps on the BS2P40 demo board?

Unfortunately the regulators mentioned above have quite a high voltage drop — typically up to 3 Volts. I can’t find a schematic of it. Rapid electronics sell the 3 and 7. Click here to view these low drop out regulators now. There is another possibility My input is 9V, I’m lm24oct the power supply eatasheet came with the P40 demo board. This is the 12 Volt one I put together.

LM2940ct 5.0 gets HOT quick.

Basic Stamp List Subject: To get around this problem low dropout l294oct were developed. Does it have a backlight? Another, does your LCD has backlights? The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it. Sign In or Register to comment.


LM2940 12V 1A Low Dropout Regulator

Hi John, What is the input voltage to the dattasheet — can you measure it? When under charge, the voltage can easily get over 14V — sufficient to cause damage to sensitive 12V equipment.

Text in the Subject and Body of the message will be ignored. I haven’t experienced it personally, but lm249oct could have an issue there that might result in overheating. I believe the data sheets show a 0. I have a 22uf cap between the output and ground as specified in the datasheet for stability.

Otherwise the output impedance is too high and it oscillates. Click here now to find out more about or to buy either LT 7. The only things being powered in the circuit is the stamp and the LCD.

This makes them perfect for use with 12 Volt lead acid batteries. I will try it with the additional cap.

LM 12V 1A Low Dropout Regulator |

Is ths just because of the load placed on it due to the lcd? Thank you for all the input. For the more commonly required voltages of 3. It can output up to 1 Amp at a fixed 12 Volts DC with a dropout of just 0.