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IXYS Announces Robust Isolated Solid State Relay With Integrated Current Limit, Over-voltage Protection And Thermal Management

IXYS Integrated Circuits Division (formerly Clare, Inc.), a wholly owned subsidiary of IXYS Corporation (NASDAQ: IXYS), announced the immediate availability of the CPC1593, the first in a new family of triple stage protection solid state relays (SSRs) that incorporate load current-limiting with over-voltage protection and thermal management. These bidirectional relays are designed to survive in the harshest operating environments for off-AC line applications.

The CPC1593 normally open (1-Form-A) optically isolated SSR features a load voltage of 600V peak maximum, continuous load current of +/- 120mA maximum and an on-resistance of 35 Ohms maximum. In a fault condition, the CPC1593 relay features a unique over-voltage protection that is activated when the voltage across the switch is greater than 21V and the device is in current limit. The over-voltage protection deactivates the switch while allowing a restricted load current of less than 100uA to flow. When the voltage across the switch falls below the over-voltage threshold, the switch resumes normal operation. If the fault persists, the over-voltage response will repeat offering the best protection for the load and the switch itself.

Current limit specification for the CPC1593 in an AC/DC configuration is +/- 285mA maximum and 570mA in the DC configuration. A thermal management circuit in the CPC1593 monitors overall die temperature in a fault condition and further restricts load current to protect the relay and load.

Key applications for this device are for advanced power management applications where the reduction of “vampire power” consumption is desired by turning off the AC power when not needed. Other applications include in-rush current control, power supplies, industrial and process controllers, solenoid and valve controls and HVAC. The device is targeted for AC power line environments where fault conditions can persist for extended periods of time and where, upon removal of the fault, return to normal operation is expected. The relay is designed to survive extended power cross conditions. The CPC1593 has UL, CSA and EN/IEC approval.

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