MitxPC M3-ATX - Manual (Page 4)

3)
Ignition=ON. Your computer will remain ON.
4)
Ignition=OFF. M3-ATX waits for “OFFDELAY” in seconds (see jumper chart) and then it turns the motherboard
OFF by sending a signal to the motherboard’s ON/OFF switch. Your computer should turn off gracefully
(shutdown procedure). After shutdown,
5)
5VSB will still be provided for another “HARDOFF” seconds. In the event where the shutdown process is longer
than “HARDOFF” (Operating System gets frozen, etc), power will be shut down hard, turning off all power rails.
During the HARDOFF procedure, the battery levels will be constantly monitored to prevent deep discharge
situations.
6)
M3-ATX will go to step 1, if ignition is tuned ON again.
NOTE. When all config. jumpers are removed, M3-ATX acts as a regular power supply, no ignition timing, no
HARDOFF. M3-ATX will send a gratuitous “ON” pulse to the M/B when power is applied for the first time. Do not
connect the on/off switch if you don’t want your PC to be started automatically.
Troubleshooting
a) Motherboard is not turning ON: Check input cables.Make sure you have a a well
tighten wire harness. Measure the un-switched pin (red). You should see 12V (car on) or
0V (car off). NOTE: In P1, P2, P3 modes if V(In) is < 12V, the M3-ATX will not start.
b) Motherboard is not turning ON (cont): Ensure total system power consumption
does not exceed the M3-ATX specifications.
c) Motherboard is not turning ON (cont). Make sure that the ON/OFF wire harness
from the M3-ATX is connected to the ON/OFF switch of your M/B.
M3-ATX Characteristics
Minimum Input Operating. voltage 6V
Maximum input Operating voltage 24V (clamping will occur at 25-27V)
Deep-Discharge shutdown threshold 11.2V
Input current limit (fuse protected) 15A
Max Output Power 125 Watts (8-16V, see chart below)
Deep Sleep Current Consumption. < 0.5mA
Storage and operating temperature -55 to +125 degrees Celsius (storage), -40 – 65C (operating)
MTBF 150,000 hrs @ 50C, 96,000 hrs @65C
Efficiency (Input 9-16V) >94%, all rails combined, 50% load.
Input connectors Faston 0.25” terminal
Output Connector ATX Power 20 pin (Molex P/N 39-01-2200)
*Units starts failing at >125 Celsius. Operating at temperatures above 85C / 185F will drastically reduce the MTBF.
Maximum Power Characteristics
Output Rail Current (Max) Current Peak
(<30 seconds) Regulation
5V 6A 8A 1.5%
3.3V 6A 8A 1.5%
M3-ATX User Guide Page 4
5VSB 1.5A 2A 1.5%
-12V 0.15A 0.2A 10%
12V 4-6A (see below) 8A (see below) 2%
When operating at <8V or >16V or extreme temperatures, de-rate by 25-50%, ventilation will be required.
12V Rail Output Current (buck/boost converter)
Input (V) 12V out current Input (V) 12V out current
6-8V 4A (6A peak) 11-16V 6A (8A peak)
8-11V 5A (7A peak) 16-24V 4A (7A peak)