Hello everyone.
I was wondering if I could make DIY power supply for my own NAS, which requires 5V and 12V outputs with various current environment.
Motherboard is odroid-xu4 (requires 5V only, manufacturer said that P/S must support 4A for peak current, but in my opinion, it doesn't make sense since I monitored power consumption and it says peak current is no more than 1.5A)
and 1 or 2 3.5inch HDD is included(each requires 12V, up to 2A peak for spinning up, up to 0.9A for active).
In my rough calculation, I need 5V 4A and 12V 4A for power, so I designed circuit that main voltage source for 19V 3.16A SMPS, which provides 60W.
and I designed my circuit as two LM2678, LM2678-5.0 and LM2678-12.0 parallel.
I selected other parts, schottky diode, inductors and capacitor from the LM2678 manual.
(some of my parts is far different in my schematic/board design and real part I bought. i.e: MBR750 in my pcb, however, I bought 6TQ045, Vishay.)
D1, D2 is Schottky diode, 6TQ045, from Vishay, which is recommended in manual.
C1, C2, C5, C6 is Low-ESR Capacitor from Nichicon, PM series(PL series is renamed into PM series, nichicon said). capacitance of these are from manual.
L1, L2 is PL-54041NL, from Pulse, recommended in manual.
So I've done all of these processes from select parts, design schematics / pcb board, to ordering. Receiving PCB, soldering PCB and test is remained.
It looks like everything goes fine, except I was newbie in circuit design and pcb artwork, and I worked without any advices and warning from others.
Suddenly, I realized that there is no way to find help if it doesn't work or making/will make problem from its defect.
Too much Introes. These are my Question.
1. Is it fine design for power supply? Am I missed something, or I designed TOTALLY WRONG that will explode everything?
2. I can't calculate its voltage ripples. how can i calculate it? and, is it fine for working HDD and my motherboard work correctly?
