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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You can then safely use a 1.

Email Required, but never shown. But I’m not sure I can find a Two resistors, a zener diode and a TL or similar shunt regulator and a few capacitors would be VERY adequate in many cases. I would even go a step further, and also place a zener diode on the input, so that you get a shunt pre-regulator.

LM78L05 Datasheet

So, LM78L05 needs bypassing for high frequencies, at most a 1uF? For instance the Littelfuse 1. The LM78L05’s absolute maximum input voltage is only 35V. So you if connect high current loads then you can expect the IC to get very hot soon and shunt down eventually.

Voltage Regulator 78L05 :: Solarbotics

The resistor will drop the input voltage and form a low-pass filter with the LM78L05’s input capacitor. To answer my own question, the schematics for both versions of the wave shield are found here, click on downloads. The lower input voltage will allow you to choose a lower voltage TVS, however. Russell suggests using a series resistor, and I concur. In addition to that bulk capacitor, I need a bypass capacitor here, you say, a nF perhaps?


About 25 Hz corner frequency. Apart from using it as a voltage regulator it can also be used as a current regulator, short-circuit protector, booster circuit and even a variable voltage regulator. It’s funny now I think the question was about capacitors: TL dissipates unwanted current.

Yaro Full Member Posts: My input voltage is 24V, however this is an automotive application, so I have a transient voltage suppressor of 33V in the input too. Go for that terafarad cap if you feel like it. Formal verification of safety-critical software, software development, and electronic design and prototyping. Another popular voltage regulator is which is bulkier in size but has high current rating of about 1A. I am going to pull at most 5 mA of current.

Kaz 17k 1 23 Situation for 1k does not change as 8V2 is the same.

78L05 5V 100mA Voltage Regulator

But, the IC suffers from heavy heat loss hence a Heat sink is recommended for projects that consume more current. Voltage regulators are very common in electronic circuits. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Resistors in series drop the 24 V to 5V. The regulated 5V can be obtained from the output pin if the Datasneet.

These “bypass capacitors”, as a rule of thumb, have to be located close to the devices being powered. By lm78o05 “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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Voltage Regulator 78L05

It is very easy and straight forward to use this IC, just connect the input in to the input voltage which has to be regulated and the ground pin to system ground. First off you need capacitors from input to ground on both regulators.

Sign up using Email and Password. 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. Submitted by webmaster on 14 December 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.

BTW for a high current profile you could modify this using a transistor based PNP power transistor voltage follower circuit configuration. However you might be better off with two or three x 1. Familiar regulator features such as short circuit and thermal overload protection are also provided. LM data sheet here.

They provide a constant output voltage for a varied input voltage. Can you suggest any sources like this? Also note the Capacitors C1 and C2 are used at both the Input and output end. This is the scheme: