Hello,
Thank you for your fast response. Indeed, I did not considered the power dissipation calculation on the device.
According to datasheet:
- Peak Non−Repetitive Surge Current (Single Cycle 60 Hz Sine Wave) = 1A
- Total Power Dissipation at 25°C Ambient = 300 mW
- Total Power Dissipation at 40°C Ambient = 300mW - ( 4mW * (40°C-25°C) ) = 240mW (condition plausible to be met)
- Total Power Dissipation at 60°C Ambient = 300mW - ( 4mW * (60°C-25°C) ) = 160mW (I consider this as worst case scenario)
According to my calculation and measurements:
- inrush:
P = 100mA*2.2V = 220mW (for about 10s)
- stabilization:
P = (40mA->20mA)*2.2V = 88mW->44mW (for about 60s)
- maintaining:
P = 10mA*2.2V = 22mW
According to above data:
- in my worst case scenario, near to the device limits, high probability to fail on power dissipation during inrush
- normal operation condition, power dissipation is ok
What would you do in this conditions? Would you place an additional power triac?
What about the series resistor, would you keep it? I was thinking to keep it to limit the inrush current bellow 1A, but I think doesn't make any sense after I see the power calculations.
Thank you!