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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My input voltage is 24V, however this is an automotive application, so I have a transient voltage suppressor of 33V in the input too. Many of these are are datasheeet 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.

Or I only need a bypass capacitor? Voltage regulators are very common in electronic circuits. These regulators also have the ability to limit current and protect when the temperature exceeds beyond junction temperature.

Two resistors, a zener diode and a TL or similar shunt regulator and a few capacitors would be VERY adequate in many cases. What is the explanation?

First off you need capacitors from input to ground on both regulators. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


78L05 5V 100mA Voltage Regulator

Then you don’t need the voltage regulator and they will last longer. So, LM78L05 needs bypassing for high frequencies, at most a 1uF?

Complete Technical Details can be found at the 78L05 datasheet given at the end of this page. Simple shunt regulator with zener diode preregulator to greatly reduce spikes: Formal verification of safety-critical software, software development, and electronic design and prototyping.

My load is just an 8-bit microcontroller and a transistor’s base with 1K in series. The LM78L05’s absolute maximum input voltage is only 35V. So, the SD Card apparently has more stringent requirements for driving.

I’ll get back to it in a minute. Also note the Capacitors C1 and C2 are used at both the Input and output end. Post as a guest Name. I would even datashewt a step further, and also place a zener diode on the input, so that you get a shunt pre-regulator. Some of these unwanted voltages will appear across that resistance.

LM78L05 Datasheet

The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. If you can’t afford the zener you can at least afford the series resistor, no? Sign up using Email and Password. About 25 Hz corner frequency. The datasheet says for ‘LM’ it’s dataxheetso your on the margin.

National Semiconductor – datasheet pdf

To answer my own question, the schematics for both versions of the wave shield are found here, click on downloads. In dagasheet Vzener will rise very slightly. The resistor will drop the input voltage and form a low-pass filter with the LM78L05’s input capacitor.


During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating voltage, the regulator lm78l005 automatically shut down to protect both the internal circuits and the load.

You don’t need the -5V supply at all.

Please post technical questions on the forum, not by personal message. So you if connect high current loads then you can expect the IC to get very hot soon and shunt down eventually. Sign up or log in Sign up using Google. It’s funny now I think the question dagasheet about capacitors: Ah, great ideas, but this is a cost sensitive application. L78l05 lower input voltage will allow you to choose a lower voltage TVS, however.

How much current does the load draw? You don’t need -5V for the mini. This is the scheme: A TVS is still a good idea though, since you’re working in an automotive environment. But I’m not sure I can find a In addition to that bulk capacitor, I datawheet a bypass capacitor here, you say, a nF perhaps? Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output lm78l0 exceeds approximately 3V.

I thought I wrote about the current, but I was wrong.