I'm almost ready to use a LED fixture I've built with my RPi (for PWM). I'll be using a 24V, 5A (60W) power supply and three driver (700mA each) to drive some LEDs. So I'll have spare 2,9 amps left. I was thinking about using a step down DC-DC converter to power the RPi with the 5V needed (using the micro-USB port anyway) in order to remove its basic power supply and simplify a bit the whole project.
I saw something similar to this: http://www.aliexpress.com/item/DZ199-DC ... 87146.html ... available through various resellers around the world at similar prices.
What do you think about? Is it feasible? Does it have any drawbacks?
To recap some of its features:
Thanks in advance for any input.Module property: Non-isolation buck
Rectification mode: Synchronous rectifier
Input voltage: 4V-35V
Output voltage: 1.23V-30V
Input current: 3A(maximum)
Conversion efficiency: 92%( highest )
Switching frequency: 150KHz
Output ripple: 30mV( maximum )
Load regulation: ±0.5%
Voltage regulation: ± 2.5%