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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So, keep this possibility in mind when designing your own applications. Possible cause of the problem: Consumption no load Consumption 1k load LCV 2. Current consumptions of both stabilizers, with and without a load. After their advice we have tested whether this problem can be caused by oscillating of the stabilizer.

As a supply, we have used a BS DC power supply and ka790 transformer with one-way rectifier. 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. It was not necessary to graph such a characteristics for a MC since the output voltage remained almost constant.

Conclusion is, that oscillations are not the cause of our overvoltage problem. Again, there was V.


We do our own development, too, and we do understand that it is not that easy to design and document something. Then, we have studied carefully the datasheets.

KA Datasheet, KA PDF – Free Datasheets, 3-Terminal 1A Negative Voltage Regulator

Two stabilizers were used for ka9705. The whole thing worked about a year or so. The comparison in this article is not totally objective. The TAS is interesting too – it has the same fault. Again, we do apologize to GM Electronic for releasing this information. Nothing like that is there.

Here, minimum load current is specified: There is no such information in L79xx datasheets see picture way above.

This is probably the cause of the problem. The marginal current 4mA corresponds to a 2k load. So, according to our measuremets, you can get up to 20V at the output of a L without a load.

(PDF) KA7905 Datasheet download

So, we examined the datasheets more closely. Output VA characteristics of a L Download datasheet for L79xx Download datasheet for L78xx Download datasheet for LM Please note the differences in internal sctructure.

The ST company can argue that this is possible; however, that the voltage from The 79xx voltage regulators series made by ST have to be connected to a load consuming at least 5 mA.


The rest of this article analyses the fact, that: We have tried several different capacitors ranging from 15 nF to datasheet uF, measured values were not significantly affected.

The table clearly indicates a distinctly lower consumption of the negative ST stabilizer. Consumption no load Consumption 1k load LCV 1.

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After a closer examination, I have found V at its reference input, instead of expected -8V. Consumption no load Consumption 1k load LCV. Datasheef, I bought a new L by ST.

Recommended operating circuit is shown. The fault is definitely caused by ST, the manufacturer. Otherwise, their input voltage decreased by about 8V appears right at the output. Input voltage 26V DC. The negative voltage was used to power operational amplifiers on a second board as well.

The internal schematics of 79xx and 78xx datashset very different you can see both internal schematics in datasheets, which are included at the end of this article. The fact that we found this fault in ST parts only does not signify that other manufacturers’ ICs are free from it.