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Thank you for all the input. Unfortunately the regulators mentioned above have quite a high voltage drop — typically up to 3 Volts. 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 load. It may help to let others know there is another low drop regulator LTCP this is rated at 5 amps and may be an idea for higher loads. When under charge, the voltage can easily get over 14V — sufficient to cause damage dataasheet sensitive 12V equipment.
A voltage regulator is a datasheft which takes an input voltage and outputs a stable fixed voltage.
The only things being powered in the circuit is the stamp and the LCD. Your use of Yahoo! With a current draw of 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. The burn lm294odt finger kind of hot.
The LM gets hot after a few min which isn’t nice. If high voltages, or high currents between 0.
LMCT datasheet, Pinout ,application circuits 1A Low Dropout Regulator
Did you take steps to obtain caps with appropriate ESR? Rapid electronics sell the 3 and 7. Does it have a backlight? Otherwise the output impedance is too high and it oscillates. 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.
Larger values of output capacitance will give improved transient response. Voltage Regulators A voltage regulator is a device which takes an input voltage and outputs a stable fixed voltage. Basic Stamp List Subject: Sign In or Register to comment. 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 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. I believe the data sheets show a datashheet. Do you know about how much output current you have? Thanks, John In basicstamps yahoogroups. I haven’t experienced it personally, but you could have an issue there that might result in overheating.
Hello, All I have is a cap between the output and ground at 22uf. The ESR of the output datashedt will cause loop instability if it is too high or too low.
The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it. What are the caps on the BS2P40 demo board? Comments 10 Comments sorted by Date Added Votes. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.
LDO Voltage Regulator (5V 1A LM2940CT, drop 0.5V @0.5A)
A low dropout regulator supplies a fixed output voltage with a typical voltage drop of just 0. Ideally a lead acid battery should never be allowed to get below There is also a 3 amp and 7. That would work alright. Another, does your LCD has backlights?
It can accept input voltages from 5. This makes them perfect for use with 12 Volt lead acid batteries. Another data sheet says 0.
1A Low Dropout Regulator
Hi John, What is the input voltage to the regulator — can you measure it? I have a 22uf cap between the output and ground as specified in the datasheet for stability. Quick Links Categories Recent Discussions. There is another possibility Text in the Subject and Body of the message will be ignored. Friday, December 05, In order to maintain a stable 12 Volt output, an external capacitor of at least 22uF must be used to smooth off the output from the integrated circuit ICwith the capacitor located as close to the IC as possible.
The LMCT range has internal short circuit and thermal overload protection, so you need to make a special effort to damage one. Variable voltage regulators are available such as the very useful LMT which the user can set to output any required voltage 1.
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.