KEYBOARD and DC/DC 12V TO 5V BOARD

Description

The keyboard board has five buttons which can be used for example to swapp between the menus displayed on the screen of the FCALLBOX SERVER.

It has also 2 DC/DC converter from 12V to 5V with an output current up to 3A and an efficiency between 85 to 90% :
- Input voltage : 4.7V to 28V.
- Output voltage : 0.8V to 25V (set here to 5V).
- Maximum output current : 3A (tested 2.5A).

Summary

• Schematic

• Bill of material

• PCB

• Assembly

Schematic

- The 12V to 5V conversion is done with a DC/DC MP2303 from Monolithicpower

Télécharger ici le schéma au format PDF

Bill of material

The BOM below shows only the components to populated.

Top view Ref Description Manufacturer / reference C40,C36,C40_1,C36_1 Capacitor 10uF 16V 20% X5R 1210 All brand R38,R38_1 Resistor 100KR 5% 0603 All brand C31,C31_1,C32,C32_1,C33,C33_1 Capacitor 100nF 16V X7R 0603 All brand C38,C38_1 Capacitor 10nF 16V X7R 0603 All brand C34,C35,C34_1,C35_1 Capacitor 22uF 6.3V 20% X5R 0805 All brand R49,R49_1 Resistor 68KR 1% 0603 All brand R48,R48_1 Resistor 13KR 5% 0603 All brand L3 Inductor 5x5mm 15uH 3.9A 80mR COILCRAFT / XAL5050-153MEC or equivalent U8 IC MP2303 SO8 MPS (Monolithic Power System) / MP2303ADN-LF TP39,TP42,TP38 Connecteur mâle 3x1 pas 2.54mm All brand TP40,TP41,TP71 Connector male 3x1 pitch 2.54mm All brand TP37,TP43 Connector male 3x1 pitch 2.54mm All brand TP44,TP46 Connector male 2x1 pitch 2.54mm All brand TP44_1,TP46_1 Connector male 2x1 pitch 2.54mm All brands

Bottom view Ref Description Manufacturer / reference C37,C37_1 Capacitor 3.3nF 16V 10% X7R 0603 All brand R47,R47_1 Resistor 10KR 5% 0603 All brand D1 à D5 Push button C & K COMPONENTS / D6R10LFS or equivalent

PCB

The board which has 49x56mm dimensions is a part of the PCB F00104 with 100x100mm dimensions.

So, you have to cut it, to get the interface board.

Download the PCB manufacturing file here

Assembly

The board has components on top and bottom sides.

Top view

Bottom view

Top view

Bottom view

Download here the top view in PDF format      Download here the bottom view in PDF format