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The whole thing worked about a year or so.

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Please note the differences in internal dztasheet. Download datasheet for L79xx Download datasheet for L78xx Download datasheet for LM Please note the differences in internal sctructure. This is true, BUT: Values shown were measured for a single sample; other samples as well as stabilizers by other manufacturers behaved similarly. However, components by other manufacturers behave differently. The internal schematics of 79xx and 78xx are very different you can see both internal schematics in datasheets, which are included at the end of this la7905.

Here, minimum load current is specified: At first, we came to a wrong conclusion, that the faulty stabilizers are sold at GM Electronic only, and we have released this information prematurely.

So, according to our measuremets, you can get up to 20V at the output of a L without a load. If this is an intention to reduce internal consumption of the circuit to a minimum, at the expense of problems with output voltage with no load, it should have been datasheft in the datasheet. A similar internal schematic is there; dataeheet, the values of the components are legible. Values listed below were measured using a nF capacitor. Stabilizers by ST differ, beginning from a certain voltage.


Recommended operating circuit is shown.

Voltage regulators (stabilizers) 78xx and 79xx

The ST stabilizer is clearly distinct. Again, there was V. Consumption no load Consumption 1k load LCV. Since the stabilizers are used more often, several other parts are shown in the graph as well. For datwsheet, input current of a positive voltage stabilizer is mentioned, too.

Figure shows the dependencies of the output voltage on the input voltage for a L, TAS, KA; both with and without a 1k load. It was not necessary to graph such a characteristics for a MC since the output voltage remained almost constant.

The comparison is only an example what a developer can buy in an electronics components store. We believe that the entire problem is caused by inadequate values of resistors between the input and the output. As I have said at the beginning of this article, I believe this fault is significant enough that we should inform about it.

Figure shows dependence of the output voltage on the input voltage for a L and a MC with no load, and with approx. We have tried several different capacitors ranging from 15 nF to 1 uF, measured values were not significantly affected. At the very ka79005 ofthe Czech subsidiary of ST has informed us that information about this behavior will be included in a future update of the respective datasheets. There, they do clearly state that the output voltage is guaranteed in a certain load current range; however, there is NO warning, that a voltage four times higher than the nominal output can appear xatasheet the output pin.

Possible cause of the problem: After a closer examination, I have found V at its reference input, instead of expected -8V.

If ST really does use such an internal structure, the problem is most likely caused by unsuitable values of resistors around the 6. Two stabilizers were used for comparison. The 79xx voltage regulators series made by ST have to be connected to a load consuming at least 5 mA. Of course, the output voltage may fluctuate; however, it can’t dataxheet four times the nominal output voltage.


Values measured The comparison in this article is not totally objective.

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

Otherwise, their input voltage decreased by about 8V appears right datzsheet the output. Then, we have studied carefully the datasheets.

After their advice we have tested whether this problem can be caused by oscillating of the stabilizer. The table clearly indicates a distinctly lower consumption of the negative ST stabilizer. The rest of this article analyses the fact, that: The negative voltage was used to power operational amplifiers on a second board as well.

So, we examined the datasheets more closely. Output VA characteristics of a L Consumption no load Consumption 1k load LCV 2.

Input voltage 26V DC. The fact that we found this fault in ST parts only ka790 not signify that other manufacturers’ ICs are free from it. Tomas Kouba Jan Rehak Translated by: So, keep this possibility in mind when designing your own applications.

Consumption no load Consumption 1k load LCV 1. Unfortunately, we could not get a sample to measure. The comparison in this article is not totally objective.