KA A 1 Amp -5V Voltage Regulator. Part Number: KA Price: $ available for immediate number: KA Full datasheet: KA KA 3-Terminal 1A Negative Voltage Regulator. Features. Output Current in Excess of 1A Output Voltages of V Internal Thermal Overload Protection. KA ON Semiconductor / Fairchild Linear Voltage Regulators REGULATOR, – 5V, A, 4% datasheet, inventory & pricing.

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The rest of this article analyses the fact, that: The company says, that they make compatible parts.

KA Datasheet –

Output VA characteristics of a L 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.

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 mentioned in the datasheet. May – 0: The whole thing worked about a year or so. Conclusion is, that oscillations are not the cause of our overvoltage problem.

So, we examined the datasheets more closely.

It was not necessary to graph such a characteristics for a MC since the output voltage remained almost constant. Two stabilizers were used for comparison. As a supply, we have used a BS DC power supply and a transformer with one-way rectifier.

Otherwise, their input voltage decreased by about 8V appears right at the output. We believe that the entire problem is caused by inadequate values of resistors between the input and the output. Tomas Kouba Jan Rehak Translated by: The fault is definitely caused by ST, the manufacturer.


However, components by other manufacturers behave differently. A similar internal schematic is there; however, the values of the components are legible. This datwsheet probably the cause of the problem. This is true, BUT: In the LM datasheet by the same company, minimal load current is specified see picture below. 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.

Some time ago, I used a pair of and to generate symmetrical reference fatasheet in my circuit. The TAS is interesting too – it has the same fault. After their advice we have tested whether this problem can be caused by oscillating of the stabilizer. Consumption no load Consumption 1k load LCV 1. Figure shows the dependencies of the output voltage on the input voltage for a L, TAS, KA; both with and without a 1k load. Again, we do apologize to GM Electronic for releasing this information.

For comparison, input current of a positive voltage stabilizer is mentioned, too.

Of course, the output voltage may fluctuate; however, it can’t be four times the nominal output voltage. The ST company can argue that this is possible; however, that the voltage from Well, I bought a new L by ST.

After a closer examination, I have found V at its reference input, instead of expected -8V. As I have said at the beginning of this article, I believe this fault is significant enough that we should inform about it.

Possible cause of the problem: Then, we have studied carefully the datasheets. We will be glad to publish a response from the manufacturer, as well as readers’ comments to this issue. If ST really does use such an internal structure, the problem is most likely caused by unsuitable values of resistors around the 6.


Here, minimum load current is specified: Since the stabilizers are used more often, several other parts are shown in the graph as well. We have contacted local subsidiary of the Motorola company since they develop and manufacture similar series of IC’s here in the Czech Republic.

Datasheet «KA7905»

The situation is similar with other stabilizers. The marginal current 4mA corresponds to a 2k load. Consumption no load Consumption 1k load LCV.

Recommended operating circuit is shown. The internal schematics of 79xx and 78xx are very different you can dtasheet both internal schematics in datasheets, which are included at the end of this article.

There is no such information in L79xx datasheets see picture way above. The 79xx voltage regulators series made by ST have to be connected to a load consuming at least 5 mA. The comparison in this article is not totally objective. So, according to our measuremets, you can get up to 20V at the output of a L without a load. The comparison is only an example what a developer can buy in an electronics components store.

Figure shows dependence of the output voltage on the input voltage for a L and a MC with no load, and with approx. We do our own development, too, and satasheet do understand that it is not that easy to design and document ddatasheet.