Voltage regulators (stabilizers) 78xx and 79xx. Redakce HW serveru, May – As a preface, I would like to say that HW server does not indend at all. LM79XX Series. 3-Terminal Negative Regulators. General Description. The LM79XX series of 3-terminal regulators is available with fixed output voltages of − 5V. 79xx voltage regulators are very commonly used in electronic Similar to IC 79xx, IC 78XX is a three pin IC that gives a constant output voltage.

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We do our own development, too, and we do understand that it is not that easy to design and document something.

IC 79xx (7905, 7912, 7915, 7918) – Negative Voltage Regulator

PDF datasheet of a 79xx by National Semiconductors. Figure 4 shows a basic 5 volt general purpose power supply. Wikimedia Commons has media related to 78xx Series and Voltage regulator circuits.

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78XX vs 79XX-Difference between 78XX and 79XX voltage regulators

After a closer examination, I have found V at its reference input, instead of expected -8V. Please note the differences in internal sctructure. Views Read Edit View history. By using zeners we can produce any number of odd voltage requirements.


Unless you are signed in to a HubPages account, all personally identifiable information is anonymized. In other projects Wikimedia Commons. The pin 2 acts as the input terminal 5V to 24V.

Pin out Configuration of IC 79xx. Mastering the Raspberry Pi. If ST really does use such an internal structure, the problem is most likely caused by unsuitable values of resistors around the 6.

Voted up, interesting and useful. Google provides ad serving technology and runs an ad network. Q1 works the same as in figure 5 or could be left out and a 5 volt zener used if reggulator requirement is under 1 amp. This article needs additional citations for verification.

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So, keep this possibility in mind when designing your own applications. At first, we came to a wrong conclusion, that the faulty stabilizers are sold at GM Electronic only, and we 78zx released this information prematurely. The comparison is only an example what a developer can buy in an electronics components store. Recommended operating circuit is shown.

In figure 6 we have added a 5. To provide a better website experience, turbofuture. May – 0: We believe that the entire problem is caused by inadequate values of resistors between the input and the output. Some devices provide slightly different voltages than usual, such as the LM78L62 6. The number 79 indicates that it is a negative voltage regulator and xx indicates the output voltage of the IC.


Again, there was V. Sign in or sign up and post using a HubPages Network account. In this section we will explore fixed, regulated power supplies. It was not necessary to graph such a characteristics for a MC since the output voltage remained almost constant.

The pin 3 acts as the output terminal constant regulated 5V. In figure 5 we have added a NPN pass transistor such as a 2N to boost output current to several amps.

IC 79xx (, , , ) – Negative Voltage Regulator | TurboFuture

The maximum value of input voltage that the IC can withstand is 24 volts. Each type employs internal current limiting, thermal shut down and safe operating area protection, making it essentially regulattor. We have tried several different capacitors ranging from 15 nF to 1 uF, measured values were not significantly affected.

This is true, BUT: Current consumptions of both stabilizers, with and without a load.