XC6227 datasheet(7/25 Pages) TOREX

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XC6227

Series

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OPERATIONAL EXPLANATION

The voltage divided by two resistors R1 and R2 is compared with the internal reference voltage by the error amplifier. The

P-channel MOSFET connected to the VOUT pin, is then driven by the subsequent output signal. The output voltage at the VOUT

pin is controlled and stabilized by a system of negative feedback. The current limit and short protection operate in relation to

the level of output current. The thermal protection operates in relation to the level of heat generation. The reverse current

protection operates when VOUT voltage is higher than VIN voltage. Further, the IC's internal circuitry can be turned off via the CE

pin's signal.

The XC6227 needs an output capacitor CL for phase compensation. Values required for the phase compensation are shown

in the chart below. If a loss of the capacitance happens, stable phase compensation may not be obtained. Please ensure to

use a capacitor which does not depend on bias or temperature too much. For a stable power input, please connect an input

capacitor CIN of 1.0μF between the VIN pin and the VSS pin.

OUTPUT VOLTAGE (V)

OUTPUT CAPACITOR VALUE

0.8V～2.05V

CL=6.8μF (MIN.)

2.1V～2.45V

CL=4.7μF (MIN.)

2.5V～5.0V

CL=2.2μF (MIN.)

The XC6227 series includes reverse current protection to prevent the damage as a result of current flow from VOUT pin to the

VIN pin and VSS pin when the power supply is connected to the VOUT pin. When VIN is smaller than VOUT, the reverse current

protection works and suppress the reverse current to 1.5μA (MAX.).

When VIN is smaller than VOUT, the VOUT pin sink current flowing from the VOUT pin to the VSS pin is 2.8μA (TYP.) as the IC

operation current.

Please also note when an external power supply is connected to the VOUT pin, please use it within 6.0V.

The XC6227 series integrates an output current limiter and a fold-back short protection for the output pin. When the load

current reaches the current limit level, the fixed current limiter circuit operates and output voltage drops. When the output pin is

short-circuited to the VSS pin, the current is decreased to a level of 55mA (TYP.).

When the junction temperature of the built-in driver transistor reaches the temperature limit level (150℃ TYP.), the thermal

shutdown circuit operates and the driver transistor will be turned OFF. The IC resumes its operation when the thermal

shutdown function is released and the IC’s operation is automatically restored because the junction temperature drops to the

level of 125℃ (TYP.) as the thermal shutdown release voltage.

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Output Capacitor (CL) Table

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