3 ms·
48V is simply too much for most electronics. Finding parts to handle 12V or even 20V is pretty trivial, but at 48V you're going to have serious trouble sourcing
by crote 3y ago
48V is simply too much for most electronics. Finding parts to handle 12V or even 20V is pretty trivial, but at 48V you're going to have serious trouble sourcing it at a reasonable price. Maybe this will change as 240W USB-C becomes common, though.
An additional issue is that the sweet spot for voltage conversion is around the 1:10 ratio. Going 120V -> 12V -> 1.2V makes a lot of sense, 120V -> 48V -> 1.2V less so.
- bsder 3y ago> Finding parts to handle 12V or even 20V is pretty trivial, but at 48V you're going to have serious trouble sourcing it at a reasonable price. I don't buy this at all. 48V and 96V are standard telecom DC voltages. Those parts already exist. If anything, this would be a big boon as it would enable using both telecom and consumer parts interchangably (thus increasing volume on both).
- pcdoodle 3y agoEven resistors have a rated voltage. 0402 for instance is about 25V.
- bsder 3y agoNah, you just have to size things correctly. Passives are fine. You use a 100K resistor if you really need to keep things at 0402 for 100V. (P=V^2/R = 0.1 watt) A 0.1uF 0402 ceramic cap rated at 100V is half a cent. The biggest problem are your power transistors with max Vgs. That requires a bit of care at 24V; requires quite a bit more care at 48V; requires very specialized topologies at 96V.
- pcdoodle 3y agoThanks, learned something new.