TPD1045F

2006-10-31

2

Block Diagram

Pin Description

Pin No.

Symbol

Pin Description

1, 2, 3

SOURCE

Source (ground) pin

4

IN

Input pin.

This pin is connected to a pull-down resistor internally, so that even when input wiring is

open-circuited, output can never be turned on inadvertently.

5 ,6, 7, 8

DRAIN

Drain pin.

When the load is short circuited and current in excess of the detection current (10A min) flows to

the drain (output) pin, the drain (output) automatically turns on or off.

Timing Chart

Note 2: The overheating detector circuits feature hysteresis. After overheating is detected, normal operation is

restored only when the channel temperature falls by the hysteresis amount (10°C typ.) in relation to the

overheating detection temperature.

DRAIN

SOURCE

IN

Over temperature

detection/protection

Over current

detection/protection

Input Signal

Overcurrent detection

(Load short circuit)

Over temperature

detection

Drain to source Voltage

Drain Current

Over current protection

Thermal shutdown

(Note 2)

Normal

Inductive load

Over temperature detection

Over temperature recovery