The Supertex HV9901 is a BiCMOS/DMOS universal relay
driver that employs PWM switching techniques. It is designed for
efficient and energy-saving operation of a low voltage relay with
supply voltages ranging from 8 to 450V DC through utilization of
the relay coils鈥?inductance.
The circuit is capable of operating over a wide input voltage
range without requiring a change of any external components.
For example, this will enable users to use 5V coil relays for DC
voltages 8 - 450V or AC voltages up to 240V.
The HV9901 has an internal high-voltage regulator to power
internal PWM circuitry. Additionally it includes an adjustable
auxiliary regulator with a 1mA capability that can be used to
supply low power microcontrollers.
The pull-in current, pull-in time and hold current are all program-
mable using only two resistors and a capacitor. The PWM
switching frequency can be either
鈥?Synchronized to an external clock, or
鈥?Synchronized to other HV9901s, where the synchronized
frequency is the highest free-running frequency
The enable (ENI) logic input is used to turn the relay on/off.
Enable polarity may be selected via the POL input. Audible noise
is prevented using fixed switching frequencies above 20kHz.
WARNING!!!
Galvanic isolation is not provided. Dangerous voltages are
present when connected to the AC line. It is the responsibility of the designer
to ensure adequate safeguards are in place to protect the end user from
electrical shock.
Features
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8V to 450V Input Voltage Range
Energy Saving Hold Current Mode
Adjustable Microcontroller Supply
Low Supply Current <1mA
Constant Current Coil Drive
Programmable Pull-in Current, Pull-in Time, and Hold
Current
Efficient PWM Operation Using the Relay Coils鈥?Inductance
Applications
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Industrial Controls
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Relay Timers
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White Goods
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Solenoid Drivers
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Home Automation
Typical Application Circuit
V
IN
VIN
VDD
Int
Reg
HV9901
SYNC
SYNC
VREF
V
REF
PWM
GT
CS
RT
H/D
V
CC
VCC
Aux
Reg
POL
ENI
ENO
Enable
Enable polarity
FB
06/25/02
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
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