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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Two stabilizers were used for comparison. Then, we have studied carefully the datasheets. So, according to our measuremets, you can get up to 20V at the output of a L without a load. The 79xx voltage regulators series made by ST have to dayasheet connected to a load consuming at least 5 mA. After a closer examination, I have found V at its reference input, instead of expected -8V.
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.
Tomas Kouba Jan Rehak Translated by: A similar internal schematic is there; however, the values of the components are legible. Nothing like that is there.
KA Fairchild 3-Terminal 1A Negative Voltage Regulator ChipFind Datasheet Archive |
As I have dqtasheet at the beginning of this article, I believe this fault is significant enough that we should inform about it. Again, there was V. The comparison is only an example what a developer can buy in an electronics components store. Since the stabilizers are used more often, several other parts are shown in the graph as well. The company says, that they make compatible parts.
(PDF) KA7905 Datasheet download
The internal schematics of 79xx datashedt 78xx are very different you can see both internal schematics in datasheets, which are included at the end dqtasheet this article.
This is probably the cause of the problem. However, the fault does not occur for commonly used input voltages. For comparison, input current of a positive voltage stabilizer is mentioned, too. We do our own development, too, and we do understand that it is not that easy to design and document something.
Current consumptions of both stabilizers, with and without a load.
However, components by other manufacturers behave differently. However, we think datasheef necessary to inform our readers about fundamental faults and errors of electronics components that ka905 cost a lot of time. 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. We have contacted local subsidiary of the Motorola company since they develop and manufacture similar series of IC’s here in the Czech Republic.
We believe that the entire problem is caused by inadequate values of resistors between the input and the output. Consumption no load Consumption 1k load LCV 2. Input voltage 26V DC. Values measured The comparison in this article is not totally objective.
Output VA characteristics of a L If ST really does use such an internal structure, the problem is most likely caused by unsuitable values of resistors around the 6. Conclusion is, that oscillations are not the cause of our overvoltage problem.
So, keep this possibility in mind when designing your own applications. So, we examined the datasheets more closely. The whole thing worked about a year or so.
Again, we do apologize to GM Electronic for releasing this information. Figure shows the dependencies datashet the output voltage on the input voltage for a L, TAS, KA; both with and without a 1k load. Recommended operating circuit is shown. As a supply, we have used a BS DC power supply and a transformer with one-way dqtasheet. Here, minimum load current is specified: The table clearly indicates a distinctly lower consumption of the negative ST stabilizer.
View ka7905 datasheet:
We have tried several different capacitors ranging from 15 nF to 1 uF, measured values were not significantly affected. The ST company can argue that this is possible; however, that the voltage from The negative voltage was used to power operational amplifiers on a second board as well.
Kw7905, we could not get a sample to measure. Consumption no load Consumption 1k load LCV 1. Dxtasheet note the differences in internal sctructure. The fault is definitely caused by ST, the manufacturer.