This reference design shows how to achieve zero-cross switching (ZCS) with a solid-state relay. The reference design features the TPSI3050-Q1 isolated switch driver. TPSI3050-Q1 device integrates a laminate transformer to achieve isolation while transferring signal and power to the secondary side. This removes the need for any isolated bias supply. In addition, the TPSI3050-Q1 device can supply auxiliary current (IAUX) to external circuitry located on the high voltage (HV) side. ZCS is done while maintaining signal isolation between the low voltage (LV) and HV side. This reference designed achieved a 12-V, 200-µs delay ZCS with a 110-VRMS, 60-Hz AC source.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
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Complete listing of design components, reference designators, and manufacturers/part numbers
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Design file that contains information on physical board layer of design PCB
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Zero-Cross Switching for Solid-State Relays Reference Design | PDF | HTML | May 04, 2022 |
| Technical article | How to achieve higher-reliability isolation and a smaller solution size with solid | PDF | HTML | May 09, 2022 |
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