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LM2940ct 5.0 gets HOT quick.
The acceptable range of ESR plotted versus load current is shown in the graph below. Rapid electronics sell the 3 and 7. 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 IC lm24oct, with the capacitor located as close to the IC as possible.
Quick Links Categories Recent Discussions. Hello, All I have is a cap between lm294kct output and ground at 22uf.
LMCT/NOPB datasheet & applicatoin notes – Datasheet Archive
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. Your use of Yahoo! Basic Stamp List Subject: Otherwise the output impedance is too high and it oscillates.
If high voltages, or high currents between 0. Hi John, What is the input voltage to the regulator — can you measure it? Thanks, John In basicstamps yahoogroups. Should I use some other voltage regulator?
Photos – easier uploading and sharing. I can’t find a schematic of it. Click here to view these low drop out regulators now. The only things being powered in the circuit is the stamp and the LCD.
A low dropout regulator supplies a fixed output voltage with a typical voltage drop of just 0. Typically, LCD displays take very little, but I’m not familiar datasjeet the unit you’re using. Larger values of output capacitance will give improved transient response.
To get around this problem low dropout regulators were developed. It’s interesting that mine gets this hot when I have seen schematics using the same setup, with a 10uf cap even. I believe the data sheets show a 0. The LMCT range has internal short circuit and thermal overload protection, so you need to make a special effort to damage one. 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:. For the more commonly required voltages of 3.
Voltage Regulators A voltage regulator is a device datashret takes an input voltage and outputs a stable fixed voltage.
Another data sheet says 0. The ESR of the output capacitor will cause loop instability if it is too high or too low.
Another, does your LCD has backlights? If you need a low dropout voltage regulator which can be adjusted lm294lct 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. It can accept input voltages from 5.
The power in Watts being dissipated within the regulator is the voltage drop across the regulator times the current passing through it. The LM gets hot dztasheet a few min which isn’t nice. When the input voltage is below Text in the Subject and Body of the message will be ignored.