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Hi X
Oh, I thought the 6 W to be 6 VA, because otherwise, if the coil is a small one, it will get very hot. Attached my calculations based on varying assumptions, and a modified simulation based on a 4.6 H coil with 8k1 losses (wire+core). There is still a power loss peak visible. And it all...
Hi X
I calculated the inductance of the coil to be 27.4 H, which leads to a time constant of 15.3 ms with the wire resistance of 1k8 alone. This means that the voltage clamped by the TVS diode remains at around 420 V for several microseconds. Assuming a slow switch-off due to the 100k resistor...
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