The case fan specs are:
Rated Voltage 12 Volts
Voltage Range 6.5 ~ 13.8 Volts
Input current 0.30 Amp Max
Input power 1.8 Watts Max
Rotation speed 1000 RPM
I have found a 5v to 12v DC-DC convertor from maplin, it all seems too simple, converting the 5v DC from the external USB port to 12v with a single chip http://www.maplin.co.uk/module.aspx?ModuleNo=98174&doy=15m3#overview
This is going to be an external fan and i cannot utilise the 12v feed from the PSU.
Does this seem like an ok solution?
Thanks
2007-03-15 06:19:26 · 3 answers · asked by reme j 1 in Science & Mathematics ➔ Engineering
The 5V line on the USB spec will supply enough power (since it's rated for 1 A, which is 5W), but your fan requires 1.8W (max) and you have a 1W converter. I would suggest you use at *least* a 2W converter, better even would be a 2.5W converter (leave yourself a bit of headroom) Digi-Key and Mouser both carry them for around $15.00
HTH ☺
Doug
2007-03-15 06:45:59 · answer #1 · answered by doug_donaghue 7 · 0⤊ 0⤋
I seriously doubt the little 1W converter will even start the fan. You might get a little "bump" as the fan tries and move past the first PM field, but then it will stall.
.
2007-03-15 07:34:00 · answer #2 · answered by tlbs101 7 · 0⤊ 0⤋
Just read what you typed. You said you have a 1 watt converter and the fan needs 1.8 watts max ...
2007-03-15 06:26:28 · answer #3 · answered by Gene 7 · 0⤊ 0⤋