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HV9901DB1 Universal Relay Driver

Contact Rating

HV9901DB1 Universal Relay Driver
Contact Rating
Enable
Auxillary Regulator (VCC)
SPDT (1FormC)
Switching Frequency
21kHz
Board Layout and Connections
Input Voltage Common
Enable Polarity Selector
IC1 R3 R1 C4 R7 C5 C2 R2 R4
Relay Contacts
Normally Closed
Normally Open Relay Selector
External Relay Sync
Enable
Ground
Supply voltage. May be a DC source in the range of 10400VDC, or an AC source in the range of 24277VACrms. A full-wave bridge rectifier on board rectifies the AC. Also included is a 250mA 2AG fuse. Relay Contacts For connecting an external load. The PCB traces are rated at 10A for a 20°C rise. Relay Selector In the Int position, the on-board relay is operated. In the Ext position, a relay connected to the External Relay terminals is operated. External Relay For connection of an off-board relay.
Sync Synchronizes multiple HV9901s to the same frequency or to a master clock. Frequency will be the highest independent frequency. Connect to the Sync pins of other HV9901s or to a master clock. Enable Logic-level enable for relay operation. See Enable Polarity Selector for polarity.
VCC Supplies 5V at 1mA for external circuitry.
Enable Polarity Selector Sets Enable polarity. In the 0 position, Enable is active low. In the 1 position, Enable is active high.
F1 250mA
HV9901DB1 Schematic
D1 DF06
C1 100nF VIN
K1 NAIS JS1-5V INT RELAY EXT
D2 S1J VDD VREF H / D
D3 ES1J
C2 4.7µF R1 R2 C3 100nF C4 1.0µF R3
Int Reg VREF
GT CS RT 1.21M R6
SYNC Q1 VN2450 11 R5
8.25k
5.0V @ 1mA
C5 1.0µF
VCC FB
Aux Reg
POL ENI ENO
374k 124k
Modifications
This equation is valid for frequencies 25kHz and above. Be advised that frequencies below 20kHz may cause the relay coil to emit audible noise. And avoid higher frequencies that approach the coils resonant frequency. VCC As provided, the HV9901DB1 supplies 5V for external circuitry. Other volltages in the range 2.0V to 5.5V may be obtained by changing R3. Current rating remains at 1mA.
21.8GHz R6
Note that changing VCC also changes the Enable logic levels.