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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There, they do clearly state that the output voltage is guaranteed in datasgeet certain load current range; however, datashwet is NO warning, that a voltage four times higher than the nominal output can appear at the output pin. After their advice we have tested whether this problem can be caused by oscillating of the stabilizer.
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. Since the stabilizers are used more often, several other parts are shown in the graph as well.
Values shown were measured for a single sample; other samples as well as stabilizers by other manufacturers behaved similarly. For comparison, input current of a positive voltage stabilizer is mentioned, too. Please note the differences in internal sctructure. So, according to our measuremets, you can get up to 20V at the output of a L without a load. In the LM datashewt by the same company, minimal load current is specified see picture below. The marginal current 4mA corresponds to a 2k load.
As a supply, we have used a BS DC power supply and a transformer with one-way rectifier. Possible cause of the problem: Some time ago, I used a pair of and to generate symmetrical reference voltage in my circuit.
View ka7905 datasheet:
The whole thing worked about a year or so. The TAS is interesting too – it has the same fault. If this is an datashret 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. Current consumptions datasheeet both stabilizers, with and without a load. Input voltage 26V DC. However, components by other manufacturers behave differently. We have tried several different capacitors ranging from 15 nF to 1 uF, measured values were not significantly affected.
KA (Fairchild) – 3-Terminal 1A Negative Voltage Regulator, Negative
There is no such information in L79xx datasheets see picture way above. Conclusion is, that oscillations are not the cause of our overvoltage problem.
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. The table clearly indicates a distinctly lower consumption of the negative Dataeheet stabilizer.
We do our own development, too, and we do understand that it is not that easy to design and document something. Values listed below were measured using a nF capacitor.
Ka datasheet pdf télécharger
The comparison in this article is not totally datasheeet. 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. Recommended operating circuit is shown. Consumption no load Consumption 1k load LCV 1. Tomas Kouba Jan Rehak Translated by: Here, minimum load current is specified: Well, I bought a new L by ST.
Stabilizers by ST differ, beginning from a certain voltage.
3-Terminal 1A Negative Voltage Regulator
Two stabilizers were used for comparison. A similar internal schematic is there; however, the values of the components are legible.
Figure shows the dependencies of the output voltage on the input voltage for a L, TAS, KA; both with and without a 1k load. However, we think it necessary to inform our readers about fundamental faults and errors of electronics components that can cost a lot of time.
This is true, BUT: Consumption no load Consumption 1k load LCV 2.