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We have contacted local subsidiary of the Motorola company since they develop and manufacture similar series of IC’s here in the Czech Republic. In the LM ak7905 by the same company, minimal load current is specified see picture below.

Some time ago, I used a pair of and to generate symmetrical reference voltage in my circuit. Input voltage 26V DC. Figure shows dependence of the output voltage on the input voltage for a L and a MC with no load, and with approx. Again, we do datashwet to GM Electronic for releasing this information. The table clearly indicates a distinctly lower consumption of the negative ST stabilizer.

The ST company can argue that this is possible; however, that the voltage from Dayasheet marginal current 4mA corresponds to a 2k load. Stabilizers by ST differ, beginning from a certain voltage. Of course, the datashedt voltage may fluctuate; however, it can’t be four times the nominal output voltage. Consumption no load Consumption 1k load LCV. The TAS is interesting too – it has the same fault.

(PDF) KA7905 Datasheet download

Again, there was V. At the very end ofthe Czech subsidiary of ST has informed us that information about this behavior will be included in a future update of the respective datasheets.

If ST really does use such an internal structure, the problem is most likely caused by unsuitable values of resistors around the 6. This is probably the cause of the problem. The negative voltage was used to power operational amplifiers on a second board as well.


Recommended operating circuit is shown. May – ,a7905 Possible cause of the problem: Otherwise, their input voltage decreased by about 8V appears right at the output. The fault is definitely caused by ST, the manufacturer.

Voltage regulators (stabilizers) 78xx and 79xx |

Since the stabilizers are used more often, several other parts are shown in the graph as well. As a preface, I would like to say that HW server does not indend at all to ‘criticise at every cost’. However, the fault does not occur for commonly used input voltages. Two ma7905 were used for comparison. Tomas Kouba Jan Rehak Translated by: So, we examined the datasheets more closely.

This is true, BUT:. Values measured The comparison in this article is not totally objective. Output VA characteristics of a L It was not necessary to graph such a characteristics for a MC since the output voltage remained almost constant.

Values shown were measured for a single sample; other samples as well as stabilizers by other manufacturers behaved similarly. Datashet comparison is only an example what a developer can buy in an electronics components store.

Consumption no load Consumption 1k load LCV 1.

The rest of this article analyses the fact, that: Conclusion is, that oscillations are not the cause of our overvoltage problem. A similar internal schematic is there; however, the values of the components are legible. Unfortunately, we could not get a sample to measure.

KA Datasheet PDF –

We do our own development, too, and we do understand that it is not that easy to design and document something. Here, minimum load current is specified: After their advice we have tested eatasheet this problem can be caused by oscillating of the stabilizer. This is true, BUT: We believe that the entire problem is caused by inadequate values of resistors between the input and the output. The ST stabilizer is clearly distinct. 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 at the output pin.


However, we think it necessary to inform our readers about fundamental faults and errors of electronics components that can cost a lot of time.

We have tried several different capacitors ranging from 15 nF to 1 uF, measured values were not significantly affected. As I have said at the beginning of this article, I believe this fault is significant enough that we should inform about it. Nothing like that is there. 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 datsheet samples of each type measured; samples purchased at different times dahasheet different stores.

Voltage regulators (stabilizers) 78xx and 79xx

However, components by other manufacturers behave differently. The fact that we found this fault in ST parts only does not signify that other manufacturers’ ICs are free from it.

There is no such information in L79xx datasheets see picture way above. The internal schematics of 79xx and 78xx are very different you can see both internal schematics in datasheets, which are included at the datasheft of this article.