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 datasheet of a 79xx by National Semiconductors. Input voltage 26V DC.
KA Datasheet(PDF) – Fairchild Semiconductor
However, the fault does not occur for commonly used input voltages. The TAS datasehet interesting too – it has the same fault.
Again, there was V. The marginal current 4mA corresponds to a 2k load. Two stabilizers were used for comparison. Conclusion is, that oscillations are not the cause of our overvoltage problem.
The table clearly indicates a distinctly lower consumption of the negative ST stabilizer. Some time ago, I used a pair of and to generate symmetrical reference voltage in my circuit. So, we ddatasheet the datasheets more closely. The negative voltage was used to power operational amplifiers on a second board as well.
Vatasheet is true, BUT:. Then, we have studied carefully the datasheets. 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.
Unfortunately, we could not get a sample to measure. Values listed below were measured using a nF capacitor.
Nothing like that is there. Otherwise, their input voltage decreased by about 8V appears right at the output. After their advice we have tested whether this problem can be caused by oscillating of the stabilizer. Again, we do apologize to GM Electronic for releasing this information. So, according to our measuremets, you can get up to 20V at the output of a L without a load.
Voltage regulators (stabilizers) 78xx and 79xx |
A similar internal schematic is there; however, the values of the components are legible. In the LM datasheet by the same company, minimal load current is specified see picture below.
Stabilizers by ST differ, beginning from a certain voltage. Figure shows dependence of the output voltage on the input voltage for a L and a MC with no load, and with approx. However, we datashet it necessary to inform our readers about fundamental faults and errors of electronics components that can cost a lot of time.
The comparison in this article is not totally objective.
Consumption no load Consumption 1k load LCV. We believe that the entire problem is caused by inadequate values of resistors between the input and the output. As a supply, we have used a BS DC power supply and a transformer with one-way rectifier. We have contacted local subsidiary of the Motorola company since they develop and manufacture similar series of IC’s here in the Czech Republic.
The ST company can argue that this is possible; however, that the voltage from May – 0: 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.
Recommended operating circuit is shown. If ST really does use such an internal structure, the problem is most likely caused by unsuitable values of resistors around the 6. Consumption no load Consumption 1k load LCV 2. There is no such information in L79xx datasheets see picture way above.
Possible cause of the problem: So, keep this possibility in mind when designing your own applications. 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, datashret should have been mentioned in the datasheet.
Output VA characteristics of a L This is probably the cause of the problem. The situation is similar with other stabilizers.