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XC6218

Series

<Output Voltage Regulator Control>

The XC6218 series consists of a reference voltage source, an error amplifier, current limit circuit, and a phase

compensation circuit plus a driver transistor.

The voltage, divided by resistors R11 & R12, which are connected to the

The P-channel MOSFET, which is

controlled & stabilized by negative feedback.

The current limit circuit and short circuit protection operate in relation to

the level of output current.

<Current Limit, Short-Circuit Protection>

The XC6218 series includes a current limit circuit, which aid the operations of the current limiter and short-circuit

protection.

When the load current reaches the current limit level (300mA, TYP.), the current limiter circuit operates and

output voltage drops.

The circuit operates to decrease the current limit as the load impedance decreases further and

the output voltage drops.

When the output pin is shorted, a current of about 50mA flows.

1.

Please use this IC within the stated absolute maximum ratings.

The IC is liable to malfunction should the ratings be

exceeded.

2.

Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output

current.

3.

compensates by the phase compensation circuit.

However, when an input wiring is long, about 0.1

μF to 1.0μF of the input capacitor,

When an under-shoot or over-shoot is large at transient response, about 0.1

μF to 1.0μF of

output capacitor, which prevents output fluctuation occurred by load fluctuation, is also recommended.

Please wire the input

4.

When the input voltage starts from 0V, over-shoot may occur because of the slope of the input rising.

In order to avoid

the over-shoot, please use the IC by setting the slope of the input rising within 0.1V/ms.

■OPERATIONAL EXPLANATION