September 8, 2019 posted by

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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The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. In addition to that bulk capacitor, I need a bypass capacitor here, you say, a nF perhaps? If you can’t afford the zener you can at least afford the series resistor, no? The INA will work down to 2. So the capacitor is useful even if the DC coming in over those long wires is as flat as a ddatasheet. How to use 78L How can I know in further designs if an analog IC needs a bypass capacitor?

If there is a capacitor there, but is far away, it means that there is a resistance in series with that capacitor. Datashedt input voltage is 24V, however this is an automotive application, so I have a transient voltage suppressor of 33V in the input too. Voltage regulators daatsheet very common in electronic circuits.

National Semiconductor

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


Kaz 17k 1 23 This makes an immense difference. So, if you are looking datashete a smaller package of voltage regulator that has small current rating in TO package then this IC might be the right choice. Russell suggests using a series resistor, and I concur.

A single LM should do the trick. Email Required, but never shown. By clicking “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. 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.

Features Dropout voltage typically 0.

Thanks for the “longish” answer Russell, you didn’t surprise me at all. Formal verification of safety-critical software, software development, and electronic design and prototyping. lj78l05

LM78L05 Datasheet PDF – 5V, Positive Regulator – TI

But, the IC suffers from heavy heat loss hence a Heat sink is recommended for projects that consume more current. You don’t need the -5V supply at all. D I’ve connected it, with the flat face front on me, like in the sketch. RussellMcMahon what is the reason for that?

Please post technical questions on the forum, not by personal message.

In practice Vzener will rise very slightly. I thought I wrote about the current, but I was wrong. 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.


These “bypass capacitors”, as a rule of thumb, have to be located close to the devices being powered. I do not understand how the series resistor will drop the voltage? About 25 Hz corner frequency. Rated reverse standoff voltage is always lower than breakdown voltage.

78L05 Voltage Regulator Pinout, Features, Equivalent & Datasheet

TL will add extra noise rejection. During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum catasheet voltage, the regulator will automatically shut down to protect both the internal circuits and the load. Add a say 10 uF and 0. Situation for 1k does not change as 8V2 is the same.

Especially if you read up on using sleep mode. In the circuit below a input voltage of 12V is regulated to 5V using the 78L The regulated 5V can be obtained from the output pin if the IC.

However you might be better off with two or three x 1.

My regulator is 2 datzsheet away from the power supply filter. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

TL — Programmable Reference Voltage. For instance the Littelfuse 1. If I do, will I encounter any problems?