Optocoupler, Phototriac Output, Zero Crossing, High dV/dt, Low Input Current

Applications

• Solid-state relay
• Lighting controls
• Temperature controls
• Solenoid / valve controls
• AC motor drives / starters
• Direct switching operation:
• The IL410, IL4108 isolated switch is mainly suited to control synchronous motors, valves, relays and solenoids. Fig. 15 shows a basic driving circuit. For resistive load the snubber circuit RS CS can be omitted due to the high static dV/dt characteristic.
• Indirect switching operation: The IL410, IL4108 switch acts here as an isolated driver and thus enables the driving of power thyristors and power triacs by microprocessors. Fig. 16 shows a basic driving circuit of inductive load. The resister R1 limits the driving current pulse which should not exceed the maximum permissible surge current of the IL410, IL4108. The resister RG is needed only for very sensitive thyristors or triacs from being triggered by noise or the inhibit current.