HV9901 Datasheet, PDF (1/16 Pages) Supertex, Inc – Universal Relay Driver

HV9901
Universal Relay Driver
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
Package Type
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.
16-lead SOIC
1
16
4
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.
 2016 Microchip Technology Inc.
DS20005550A-page 1