Reliability of dimmers
When building a dimmer for lighting, how can the reliability of the power supply be increased? I'm asking this because I've installed a lot of Insteon products which have a LNK304 inside. They are about 7-10 years old and the power supplies are dying in hundreds of devices forcing them to be replaced. The failure mode is exactly the same in all of devices -- they start blinking on/off. They work for a few seconds, then warm up and fail, and repeat when they cool. The TRIAC is not involved, same failure mode if the lighting load is not turned on.
Any comment on why the Insteons are failing? I have disassembled multiple units and there is no visible sign of component failure. The failure mode is common to dimmers, on/off, and keypads.
How would the reliability of the older Insteon design compare to the new DER-865 design?
Would using an isolated supply for the MCU and a small discrete supply for the TRIAC/MOSFET drive be more reliable?