Everyone is probably wore out about this subject, but here goes. Does using a pfet like a
Si5855CDC make sense as a high side switch for a solar garden light? May have overlooked something here, so just asking before stocking up
.
It includes a handy integrated schottky diode. It has a very low Vgs saturation voltage (1V max), which makes using the solar cell as the light sensor seem feasible. The Rdson of this pfet is < 0.2Ω, much lower than a small signal fet which can be from 1-10Ω. And, the cost is about $0.20.
Looking at other solutions, in low quantities, seems to put them in a $0.50-0.60 range.
1)Ldr, pfet, schottky diode
2)Photodiode, comparator, pfet, schottky diode
3)Pic10f204, schottky diode