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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(PDF) KA7905 Datasheet download
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.
Since the stabilizers are used more often, several ka7950 parts are shown in the graph as well. 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. We will be glad to publish a response datwsheet the manufacturer, as well as readers’ comments to this issue. The 79xx voltage regulators series made by ST have to be connected to a load consuming at least 5 mA.
Please note the differences in internal sctructure. The table clearly indicates a dataxheet lower consumption of the negative ST stabilizer. Figure shows the dependencies of the output voltage on the input voltage for a L, TAS, KA; both with and without a 1k load. Of course, the output voltage may fluctuate; however, it can’t be four times the nominal output voltage.
However, components by other manufacturers behave differently. At first, we came to a wrong conclusion, that the faulty stabilizers are adtasheet at GM Electronic only, and we have released this information prematurely.
The whole thing worked about a year or so. In the LM datasheet by the same company, minimal load current is specified see picture below.
Conclusion is, that oscillations are not the cause of our overvoltage problem. The TAS is interesting too – it has the same fault.
The company says, that they make compatible parts. As I have said at the beginning of this article, I believe this fault is significant enough that we should inform about it.
For comparison, input current of a positive voltage stabilizer is mentioned, too. May – 0: The situation is similar with other stabilizers. 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 article. This is probably the cause of the problem.
After a closer examination, I have found V at its reference input, instead of expected -8V. Then, we have studied carefully the datasheets. However, the fault does not occur for commonly used input voltages. Values listed below were measured using a nF capacitor.
Two stabilizers were used for comparison. PDF datasheet of a 79xx by National Semiconductors. The negative voltage was used to power operational amplifiers on a second board as well.
However, we think it necessary to inform our readers about fundamental faults and errors of electronics components that can cost a lot of time.
KA Datasheet, KA PDF – Free Datasheets, 3-Terminal 1A Negative Voltage Regulator
This is true, BUT:. The fact that we found this fault in ST parts only does not signify that other manufacturers’ ICs are free from it. The marginal current 4mA corresponds to a 2k load. We have contacted local subsidiary of the Motorola company since they datashheet and manufacture similar series of IC’s here in the Czech Republic.
Stabilizers by ST differ, beginning from a certain voltage. Again, there was V.
3-Terminal 1A Negative Voltage Regulator
So, keep this possibility in mind when designing your own applications. So, we examined the datasheets more closely. The ST stabilizer is clearly distinct.
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.
Values shown were measured for a single sample; other samples as well as stabilizers by other manufacturers behaved similarly. The rest of this article analyses the fact, that: Possible cause of the problem: Values measured The comparison in this article is not totally objective.
Recommended operating circuit is shown. We do our own development, too, and we do understand that it is not that easy to design and document something. We believe that the entire problem is caused by inadequate values of resistors between the input and the output. So, according to our measuremets, you can get up to 20V at the output of a L without a load.