General Description
The Supertex HV9901 is a BiCMOS/DMOS universal relay driver that employs PWM switching techniques. It is designed for efficient and energysaving operation of a low voltage relay with supply voltages ranging from 10 to 450V DC through utilization of the relay coils’ inductance.

Features
► 10 to 450V input voltage range
► Energy saving hold current mode
► Adjustable microcontroller supply
► Low supply current <1.0mA
► Constant current coil
► Programmable pull-in current, pull-in time, and hold current
► Efficient PWM operation using the relay coils’ inductance

Applications
► Industrial controls
► Relay timers
► Solenoid drivers
► Home automation