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 fact that we found this fault in ST parts only does not signify that other manufacturers’ ICs are free from it. Nothing like that is there. Recommended operating circuit is shown. After their ma7905 we have tested whether this problem can be caused by oscillating of the stabilizer. A similar internal schematic is there; however, the values kz7905 the components are legible. We have tried several different capacitors ranging from 15 nF to 1 uF, kz7905 values were not significantly affected.
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. However, the fault does not occur for commonly used input voltages.
May – 0: Conclusion is, that oscillations are not the cause of our overvoltage problem. However, we think it necessary to inform our readers about fundamental faults and errors of electronics datashret that can cost a lot of time. The internal schematics of 79xx and 78xx are very different you can see both internal schematics in datasheets, which are eatasheet at the end of this article.
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. Again, there was V. However, components by other manufacturers behave differently.
The TAS is interesting too – it has the same fault. Tomas Kouba Jan Rehak Translated by: La7905 I have said at the beginning of this article, I believe this fault is significant enough that we should inform about it. We will be glad to publish a response from the manufacturer, as well as readers’ comments to this issue.
Ka7905 datasheet pdf télécharger
Consumption no load Consumption 1k load LCV 1. The comparison is only an example what a developer can buy in an electronics components store. Consumption no load Consumption 1k load LCV ak7905. For comparison, input current of a positive voltage stabilizer is mentioned, too.
Voltage Regulator IC | Datasheet
The whole thing worked about a year or so. After a closer examination, I have found V at its reference input, instead of expected -8V. As a supply, we datasheeet used a BS DC power supply and a transformer with one-way rectifier. The marginal current 4mA corresponds to a 2k load. The 79xx voltage regulators series made by ST have to be connected to a load consuming at least 5 mA.
The ST company can argue that this is possible; however, that the voltage from Stabilizers by ST differ, beginning from a certain voltage. This is probably the cause of the problem. Two stabilizers were used datasueet comparison.
Well, I bought a new L by ST. Current consumptions of both stabilizers, with and without a load. We do our own development, too, and we do understand that it is not that easy to design and document something.
Figure shows the dependencies of the output voltage on the input voltage for a L, TAS, KA; both with and without a 1k adtasheet.
KA Datasheet PDF – Fairchild Semiconductor
The fault is definitely caused by ST, the manufacturer. Values listed below were measured using a nF capacitor.
Download datasheet for L79xx Download datasheet for L78xx Download datasheet for LM Please note the differences in internal sctructure. 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.
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. The company says, that they make compatible parts. PDF datasheet of a 79xx by National Semiconductors. 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.
Figure shows dependence of the output voltage on the input voltage for a L and a MC with no load, and with approx. As a preface, I would like to say that HW server does not indend at all to ‘criticise at every cost’.
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. Unfortunately, we could not get a sample to measure.
The table clearly indicates a distinctly lower consumption of the negative ST stabilizer.