KA350 データシートの表示（PDF） - Fairchild Semiconductor

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KA350

3-Terminal 3A Positive Adjustable Voltage Regulator

Fairchild Semiconductor 

Typical Application

Input

KA350

Output

Figure 13.

CI : CI is required if the regulator is located an appreciable distance from power supply filter.

CO : Output capacitors in the range of 1µF to 100µF of aluminum or tantalum capacitor are commonly used to provide

improved output impedance and rejection of transients.

In operation, the KA350 develops a nominal 1.25V reference voltage, VREF, between the output and adjustment terminal. The

reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I1 then flows

through the output set resistor R2, giving an output voltage of

VO = 1.25V(1+R2/R1) + IADJ R2

Since IADJ current (less than 100µF) from the adjustment terminal represents an error term, the KA350 was designed to mini-

mize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current is returned to the

output establishing a minimum load current requirement. If there is insufficient load on the output, the output voltage will rise.

Since the KA350 is a floating regulator, it is only the voltage differential across the circuit which is important to performance,

and operation at high voltage with respect to ground is possible.

Since IADJ is controlled to less than 100µA, the error associated with this term is negligible in most applications.

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