LMCT-5 Datasheet, LM 5V Low Dropout Voltage Regulator Datasheet, buy LMCT Pin 5 and 6 need to be tied together on PCB board (5) ESD rating is based on the human body model, pF discharged LMCT/NOPB .. in TI data books or data sheets is permissible only if reproduction is without alteration. Digi-Key Part Number, LMCT/NOPB-ND. Copy LMCT/NOPB- ND. Quantity Datasheets, LMN, C Datasheet. Design Resources.
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Many of the regulators require capacitance on the input and output to minimize oscillation. The power in Watts being dissipated lm29940ct-5.0 the regulator is the voltage drop across the regulator times the current passing through it.
Photos – easier uploading and sharing. Mine is unfortunately putting out more than 5V, which defeats the purpose of having a regulator.
The battery is lm29440ct-5.0 little over 9V.
I’m pretty sure Cap value correlates to the noise frequency, so no, you can’t just “go over” the value and still have the same effect. Friday, December 05, I went digging through my dad’s old junk box and found a 16V, uF electrolytic cap.
According to the diagram Input is on the left, GND is in the middle, and the 5V output should be on the right. You probably still need the capacitor. Did you take steps to obtain caps with appropriate ESR? OK – I see the third line info now! Further reading of the spec sheet yields Even linear regulators are switching devices, which generate some noise that must be filtered.
Does it have a backlight? The LM gets hot after a few min which isn’t nice. Typically, LCD displays take very little, but I’m not familiar with the unit you’re using.
LM2940ct 5.0 gets HOT quick.
The output capacitor is required to ‘maintain stability’ which probably means to keep it from oscillating, which in turn could cause the strange output readings you are getting. Also, remember the more voltage you have to drop and the more current you want to pull, the hotter the device will run.
Quick Links Categories Recent Discussions. My camera had a hard time catching the writing so I’ve added labels so you can see what’s printed on it.
Hello, All I have is a cap between the output and ground at 22uf. Is ths just because of the load placed on it due to the lcd?
The burn your finger kind of hot. The acceptable range of ESR plotted versus load current is shown in the graph below. There is another possibility It is essential that the output capacitor meet these requirements, or oscillations can result.
Otherwise the output impedance is too high and it oscillates. Wondering if anyone has some wisdom to share, and if they can tell me if I’m even hooking this thing up properly to begin with.
I can’t find a daasheet of it.
LDO Voltage Regulator (5V 1A LM2940CT, drop 0.5V @0.5A)
Thanks for the insight, guys. I wonder if this will pose a problem. Hi John, What is the input voltage to the regulator — can you measure it? My input is 9V, I’m using the power supply that came with the P40 demo lm2940ctt-5.0.
Text in the Subject and Body of the message will be ignored. Voltage regulator not working as expected. Here’s a snip from p. The actual values of the caps matter, too.