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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Only ceramic caps are low in ESR,ceramics will reduce the ripple up to the level that your bulk cap can handle.

This makes an immense difference. If it is right so I can power arduino mini 3v3 with the two outputs of the voltage regulators or do I need to use the output of LM78L05 and the gnd of LM79L Use a uF electrolytic for more notional rejection.

Situation for 1k does not change as 8V2 is the same. LM data sheet here.

The datasheet says for ‘LM’ it’s 35vso your on the margin. The three terminals are Input, Output and ground as shown in the 78L05 pinout diagram. I’ll get back to it lm78ll05 a minute.

Rated reverse standoff voltage is always lower than breakdown voltage.

LM78L05 Datasheet

A zener at the lk78l05 midpoint clamps this to l7m8l05 12V or some convenient value and greatly reduces transients. I would even go a step further, and also place a zener diode on the input, so that you get a shunt pre-regulator. But when I measure the voltage between the two outputs O I note 10v, it’s right? To answer my own question, the schematics for both versions of the wave shield are found here, click on downloads.


Voltage Regulator 78L05 :: Solarbotics

I know that I need at least a 10nF capacitor load in the output to limit high frequency noise, as per Note 4 in the electrical characteristics table. However you might be better off with two or three x 1. First off you need capacitors from input to ground on both regulators. If you can’t afford the zener you can at least afford the series resistor, no?

In the circuit below a input voltage of 12V is regulated to 5V using the 78L I want to use LM78L05 as a fixed output voltage regulator as shown in the datasheetas I cited below.

78L05 5V mA Voltage Regulator | DA78L05 |

My input voltage is 24V, however this is an automotive application, so I have a transient voltage suppressor of 33V in the input too. But I’m not sure I can find a These “bypass capacitors”, as a rule of thumb, have to be located close to the devices being powered.

Thanks for the “longish” answer Russell, you didn’t surprise me at all. How to use 78L The resistor will drop the input voltage and form a low-pass filter with the LM78L05’s input capacitor. Sign up using Facebook. This is a 5V.

If TI says a nF is required at the input, for pete’s sake, put it there! Kaz 17k 1 23 By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


Resistors in series drop the 24 V to 5V. These regulators also have the ability to limit current and protect when the temperature exceeds beyond junction temperature. Yaro Full Member Posts: Voltage regulators are very common in electronic circuits. Some of these unwanted voltages will appear across that resistance. In addition to that bulk capacitor, I need a bypass capacitor here, you say, a nF perhaps? See Fig 5 on the datasheet.

I am going to pull at most 5 mA of current. TL — Programmable Reference Voltage.

Then you don’t need the voltage regulator and they will last longer. The output current of this Dataheet can go up to mA. 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. Complete Technical Details can be found at the 78L05 datasheet datashete at the end of this page.

You can then safely use a 1. Also note the Capacitors C1 and C2 are used at both the Input and output end. Familiar regulator features such as short circuit and thermal overload protection are also provided.