The LM78LXX series of three terminal positive regulators is available with several fixed output voltages making them useful in a wide range of applications . LM78L05 ELECTRICAL CHARACTERISTICS. (VI = 10V, IO = 40mA, 0°C ≤ TJ ≤ °C, CI = µF, CO = µF, unless otherwise specified. (Note 1). Part Number: LM78L05, Maunfacturer: National Semiconductor, Part Family: LM, File type: PDF, Document: Datasheet – semiconductor.
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Many of these are are specially designed for an automotive environment check spec sheet in each case and will survive in places where an LM will be destroyed or will protect your 5V powered circuit in situations where an LM would allow it to be destroyed.
These regulators also have the ability to limit current and protect when the temperature exceeds beyond junction temperature.
My input voltage is 24V, however this is an automotive application, so I have a transient voltage suppressor of 33V lm78,05 the input too.
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The lower input voltage will allow you to choose a lower voltage TVS, however. If I do, will I encounter any problems? A zener at the resistor midpoint clamps this datashete say 12V or some convenient value and greatly reduces transients. Especially if you read up on using sleep mode.
78L05 5V 100mA Voltage Regulator
Complete Technical Details can be found at the 78L05 datasheet given at the end of this page. This is the scheme: The 78L05 is a three terminal voltage regulator.
The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. I want to use LM78L05 as a fixed output voltage regulator as shown in the datasheetas I cited below.
My regulator is 2 meters away from the power supply filter. Because the maximum current that this IC could supply is only upto mA. But I have doubts. Russell suggests using a series resistor, and I concur. In our case the 78L05 IC is datashee iconic regulator IC that finds its application in most of the projects.
The resistor will drop the input voltage and form a low-pass filter with the LM78L05’s input capacitor. I am going to pull at most 5 mA of current. Rated reverse standoff voltage is always lower than breakdown voltage. LM data sheet here. So the capacitor is useful even if the DC coming in over those long wires is as flat as a pancake.
LM78L05 Datasheet(PDF) – TI store
In addition to that bulk capacitor, I need a bypass capacitor here, you say, a nF perhaps? Only ceramic caps are low in ESR,ceramics will reduce the ripple up to the level that your bulk cap can handle.
Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output voltage exceeds approximately 3V. In the circuit below a input voltage of 12V is regulated to 5V using the 78L Bypass caps are often put individually across the power supply legs of individual integrated circuits or other components to try to trap these stray signals.
A TVS is still a good idea though, since you’re working in an automotive environment. Ah, great ideas, but this is a cost sensitive application. The LM78L05’s absolute lm7l05 input voltage is only 35V.