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PD166037T1J Datasheet

3. Specification

R07DS1114EJ0200 Rev.2.00

Page 12 of 39

May 22, 2015

Switching an inductive load

The dynamic clamp circuit works only when the inductive load is switched off. When the inductive load is switched off,

the voltage of OUT falls below 0V. The gate voltage of SW1 is then nearly equal to GND. Next, the voltage at the

source of SW1 (= gate of output MOS) falls below the GND voltage.

SW1 is turned on, and the clamp diode is connected to the gate of the output MOS, activating the dynamic clamp circuit.

When the over-voltage is applied to VCC, the gate voltage and source voltage of SW1 are both nearly equal to GND.

SW1 is not turned on, the clamp diode is not connected to the gate of the output MOS, and the dynamic clamp circuit is

not activated.

Von,clamp

0

0

0

t

0

GND

OUT

Internal ground

logic

IN

SEN

SW1

IS