VIA Technologies EPIA-M Mini-ITX Manual de usuario descargar pdf (Pagina 20)

Mini-ITX Power Solutions Andrei Bulucea

Automotive Solutions Ituner Networks

DC-DC converters - 20 - Automotive Applications

Fig 2.3 shows the ITPS module mounted inside the mini-box.com M100. All M-100 units have

mounting space for ITPS, thus making the M-100 a perfect candidate for automotive applications.

Stuff List

This is the list of components required to build the ITPS power sequencer.

All components are available for on-line purchasing from Digi-Key.com. The DigiKey heat sink

part number is not included (see specification above).

Stuff list for ITPS1A Options:

SMT resistors:

2 #9 R4 R5 R 10kR 5% 0.1W 0805

2 #17 R1 R2 R 1kR 5% 0.1W 0805

1 #40 R3 R 4.7kR 5% 0.1W 0805

SMT capacitors:

2 #114 C1 C2 C 0.1uF 20% 50V Z5U 0805

SMT active:

1 #56 D1 BAV99 dual diode SOT-23

1 #823 D2 Schottky diode MBRS340 3A 40V SMC

1 #853 Q2 FET IRFR5305 p-ch DPAK

1 #290 U3 IC 78L05M SO8 regulator

1 #856 D3 TVS SMBJ18A

1 #31 Q1 Transistor 2N3904 SOT23

1 #850 D4 Zener BZX84C15 15V SOT23

Through hole:

2 #849 C3 C4 C 47uF 50V elyt. 6.3 x 11 mm

1 #70 J2 Header 2x1 polarized

1 #852 J3 Header 3x1 0.156" pol. no pin 2

1 #851 J1 Header 3x1 0.156" polarized

1 #855 F1 PolyFuse RUE600 6A PTH

1 #185 U2 Socket DIP8

Second hand load:

1 #186 U2 IC PIC12C508A DIP8 Uc

Installing the ITPS in a Car

Switched and un-switched battery can be easily found in a car. Remove the keys from ignition

and, using a voltmeter, look for the continuous 12 V. Usually, the alarm system as well as your

radio/CD unit use un-switched (continuous) power. Using a T-TAP (see fig 4.0) and a “fast

disconnect male” connector, wire the continuous 12 V to the +12 V pin on your ITPS and the

ground to GND. Use 12-16 AWG cables.

If uninterrupted 12 V cannot be easily found inside the passenger compartment, you can always

wire it directly from the car battery. You just need to find a hole into the car’s firewall, usually

covered by a removable plastic cap. If a removable plastic cap is not found, you can use existent

holes to bring is your wires from the engine compartment inside your car.

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