NCV4276(2011) データシートの表示（PDF） - ON Semiconductor

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NCV4276
(Rev.:2011)

400 mA Low-Drop Voltage Regulator

ON Semiconductor 

NCV4276, NCV4276A

Setting the Output Voltage (Adjustable Version)

The output voltage range of the adjustable version can be

set between 2.5 V and 20 V. This is accomplished with an

external resistor divider feeding back the voltage to the IC

back to the error amplifier by the voltage adjust pin VA.

The internal reference voltage is set to a temperature stable

reference of 2.5 V.

The output voltage is calculated from the following

formula. Ignoring the bias current into the VA pin:

VQ + [(R1 ) R2) * Vref]ńR2

Use R2 < 50 k to avoid significant voltage output errors

due to VA bias current.

Connecting VA directly to Q without R1 and R2 creates

an output voltage of 2.5 V.

Designers should consider the tolerance of R1 and R2

during the design phase.

The input voltage range for operation (pin 1) of the

adjustable version is between (VQ + 0.5 V) and 40 V.

Internal bias requirements dictate a minimum input voltage

of 4.5 V. The dropout voltage for output voltages less than

4.0 V is (4.5 V − VQ).

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