14/30

XC9281/XC9282 Series

■OPERATIONAL EXPLANATION(Continued)

＜Current Limit＞

The current limit function monitors a current flowing through Pch MOS driver transistor and Nch MOS driver transistor and limits

the current. The operation at overcurrent is as follows.

1) When the current flowing through the Pch MOS driver transistor increases and reaches the current limit value ILIMH=1000mA

(TYP.), the current limit state is set and the Pch MOS driver transistor is forcibly turned off.

2) The Nch MOS driver transistor turns on after turning off the Pch MOS driver transistor by the current limit function. The Pch

MOS driver transistor is prohibited to turn on until the current value flowing through the Nch MOS driver transistor drops to

ILIML=800mA (TYP.).

3) Repeat the operations 1) and 2) during the current limit state.

4) When the current limit state is canceled, it automatically returns to normal operation.

ILIMH

LIML

ILX

0A

Curren t Limit State

I

VLX

0V

VOUT

0V