KA7905 DATASHEET PDF

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 ST company can argue that this is possible; however, that the voltage from Please note the differences in internal sctructure. Values listed below were measured using a nF capacitor.

Current consumptions of both stabilizers, with and without a load. Input voltage 26V DC. Values shown were measured for a single sample; other samples as well as stabilizers by ka77905 manufacturers behaved similarly. Nothing like that is there. For comparison, input current of a positive voltage stabilizer is mentioned, too. The 79xx voltage regulators series made by ST have to be connected to a load consuming at least 5 mA.

The comparison is only an example what a developer can buy in an electronics components store. If this is an la7905 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.

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. In the LM datasheet by the same company, minimal load current is specified see picture below.

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KA Datasheet PDF – Fairchild Semiconductor

Well, I bought a new L by ST. The fact that we found this fault in ST parts only does not signify that other manufacturers’ ICs are free from it. Two stabilizers were used for comparison. The TAS is interesting too – it has the same fault. We do our own development, too, and we do understand that it is not that easy to design and document something. Consumption no load Consumption 1k load LCV 1. Possible cause of the problem: This is probably the cause of the problem.

Again, we do apologize to GM Electronic for releasing this information.

Otherwise, their input ks7905 decreased by about 8V appears right at the output. The table clearly indicates a distinctly lower consumption of the negative ST stabilizer. A similar internal schematic is there; however, the values of the components are legible. There, they do clearly state that the output voltage is guaranteed in a certain load current range; however, there is NO warning, datasheft a voltage four times higher than the nominal output can appear at the output pin.

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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. Consumption no load Consumption 1k load LCV 2. The situation is similar with other stabilizers. However, the fault does not occur for commonly used input voltages. Figure shows the dependencies of the output voltage on the input voltage for a L, TAS, KA; both with and without a 1k load.

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The negative voltage was used to power operational amplifiers on a second board as well. We will be glad to publish a response from the manufacturer, as well as readers’ comments to this issue.

PDF datasheet of a 79xx by National Semiconductors. Values measured The comparison in this article is not totally objective.

Ka7905 datasheet pdf télécharger

Unfortunately, we could not get a sample to measure. This is true, BUT:. We have contacted local subsidiary of the Motorola company since they develop and manufacture similar series of IC’s here in the Czech Republic. Tomas Kouba Jan Rehak Translated by: May – 0: Conclusion is, that oscillations are not the cause of our overvoltage problem.

Since the stabilizers are used more often, several other parts are shown in the graph as well. The fault is definitely caused by ST, the manufacturer.

So, keep this possibility in mind when designing your own applications. Recommended operating circuit is shown.