M61558FP

Rev.1.0, Sep.19.2003, page 13 of 17

Conditions required for resumption from abnormal states

Abnormal state

Condition for resumption

VDD under voltage

After the voltage has returned to the normal level and this has been confirmed by the

internal VDD detection circuit, the IC resumes normal operation on the next rising

edge of either INA+ or INB+.

Over Temperature, over current

After the state has returned to normal, the condition for resumption is the falling edge

of EN. The IC then returns to normal operation on the next rising edge of either INA+

or INB+.

Timing chart for protector detection-output PROUT (pin 21) and enable input EN (pin 25)

Detctiond Protect detected (Over Temperature or Over current)

1 to 10

µs or less

On input of the low level to EN (pin 19),

normal operation resumes on the next

rising edge of input signal INA+ or INB+.

Protect Operation

(End of protect evnaition)

INA+ or INB+

Power-output stage

FET control

Normal

operation

Normal

operation

Recovery of PROUT (on the falling edge of EN)

Protector detection-circuit output

PROUT (pin 21)

Enable input EN

(pin 25)