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A similar internal schematic is datasheey however, the values of the components are legible. Conclusion is, that oscillations are not the cause of our overvoltage problem.

This is true, BUT: In the LM datasheet by the same company, minimal load current is specified see picture below. So, we examined the datasheets more closely.

It was not necessary kka7905 graph such a characteristics for a MC since the output voltage remained almost constant. The 79xx voltage regulators series made by ST have to be connected to a load consuming at ak7905 5 mA. Of course, the output voltage may fluctuate; however, it can’t be four times the nominal output voltage. The comparison is only an example what a developer can buy in an electronics components store. Recommended operating circuit is shown. Current consumptions of both stabilizers, with and without a load.


The ST stabilizer is clearly distinct.

【KA】KA【FAIRCHILD】KA【FSC】HKinventory – 에서 스톡 공급자【가격】【Datasheet PDF】

We will be glad to publish a response from the manufacturer, as well as readers’ comments to this issue. Possible cause of the problem: The whole thing worked about a year or so.

We have contacted local subsidiary of the Motorola company since they develop and manufacture similar series of IC’s here in the Czech Republic. The rest of this article analyses the fact, that: In most cases, only a single sample of a given type by a given manufacturer was available; exceptions are MC 3 samples measured and, of course, stabilizers by ST 5 samples of each type measured; samples purchased at different times in different stores.

Nothing like that is there. The table clearly indicates a distinctly lower consumption of the negative ST stabilizer. PDF datasheet of a 79xx by National Semiconductors. The fact that we found this fault in ST parts only does not signify that other manufacturers’ ICs are free from it.

So, keep this possibility in mind when designing your own applications. Here, minimum load current is specified: The company says, that they make compatible parts. The ST company can argue that this is possible; however, that the voltage from The marginal datasheeet 4mA corresponds to a 2k load. The comparison in this article is not totally objective. Some time ago, I used a pair of and to generate symmetrical eatasheet voltage in my circuit.


Input voltage 26V DC.

Voltage regulators (stabilizers) 78xx and 79xx

Again, there was V. This is probably the cause of the problem. Values measured The comparison in this article is not totally objective.

Figure shows ka79005 of the output voltage on the input voltage for a L and a MC with no load, and with approx. Otherwise, their input voltage decreased by about 8V appears right at the output. Values listed below were measured using a nF capacitor. Two stabilizers were datashdet for comparison. Download datasheet for L79xx Download datasheet for L78xx Download datasheet for LM Please note the differences in internal sctructure.

Consumption no load Consumption 1k load LCV 2. Consumption no load Consumption 1k load LCV 1.