This application note presents test results obtained using ACS108 AC switch devices in order to analyze their behavior when subjected to standard ring wave surges.
This document details the behavior of ACS108 AC switch devices when subjected to standard ring wave surges defined in the UL858A. The tests were conducted by applying normalized impulse waves directly to the semiconductor and load without a coupling network.
Three types of loads were evaluated: valves, pumps, and resistors. Results indicate that while well-insulated valves and pumps generally withstand the surge stress, insufficient valve insulation can lead to device destruction due to uncontrolled current flow. The note concludes with recommendations for ensuring compatibility when using these switches.
The test procedure is described in the UL858A standard.
If the valve insulation breaks down, the load behaves like a short-circuit and current could reach up to 120 A.
Yes, ACSs can withstand such a stress without any damage because the current pulse lasts only around 100 ns.