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DS20005550A-page 1

Features

• 10V to 450V Input Voltage Range

• Energy-saving Hold Current Mode

• Adjustable Microcontroller Supply

• Low Supply Current <1 mA

• Constant-current Coil Drive

• Programmable Pull-in Current, Pull-in Time and

Hold Current

Applications

• Industrial Controls

• Relay Timers

• Solenoid Drivers

• Home Automation

General Description

The HV9901 universal relay driver provides high-effi-

ciency driving for low-voltage relays with supply volt-

ages as high as 450V. For example, a relay with a 5V

coil can be driven directly from the rectified 120 VAC or

230 VAC line.

The IC includes two high-voltage linear regulators. The

first one is for providing power to internal control cir-

cuitry. The second one has an adjustable output volt-

age and a 1 mA output current capability to support

external circuitry, such as a microcontroller control cir-

cuit.

The pull-in current, pull-in time and hold current for the

relay are individually programmable through two resis-

tors and a capacitor. PWM switching can be synchro-

nized with an external clock or with another HV9901

operating at a higher frequency.

The relay is operated through the enable input ENI.

Logic polarity is under control of the polarity input POL.

Audible noise coming from the relay can be sup-

pressed by operating at a PWM frequency exceeding

20 kHz.

Package Type

1

16

4

16-lead SOIC

See Table 2-1 for pin information.

WARNING

The HV9901 is suited for relay driving applications operating at hazardous voltage. Ensure that adequate

safeguards are provided to protect the end user from electrical shock.

HV9901

Universal Relay Driver