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order to prevent such situations. M4-ATX operates as low as 6V and as high as 30V
while providing strict regulation as well as input voltage clamping and reverse protection.
Anti-Thump: If your PC is connected to your car amplifier, you will hear a loud pop when
the computer is first started. The M4-ATX has an 'anti-thump' control that will keep your
amp OFF while the PC starts. Simply connect the 2 pin wire to J6 harness to your
amplifier remote control pins. The pin at the edge of the PCB is GND, inner pin is HOT.
Mode of operation explained
1)
Ignition=OFF. Nothing happens. M4-ATX is waiting for ignition signals.
2)
Ignition=ON. M4-ATX waits for few seconds then turns on the 5VSB rail. After another second M4-ATX
sends an "ON" signal to the motherboard via the 2 wires connected to the motherboard's ON/OFF pins.
The motherboard will turn ON and your system should start booting. The Ignition state will be latched for
60 more seconds so that the motherboard will have a change to come up in a clean manner.
3)
Ignition=ON. Your computer will remain ON.
4)
Ignition=OFF. M4-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, 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.
5)
M4-ATX will go to step 1, if ignition is tuned ON again.
NOTE. When all dip switches are off, M4-ATX acts as a regular power supply. M4-ATX will also send a gratuitous "ON"
pulse (to the ON/OFF motherboard pins, should you have a wire harness connected to it) 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.
M4-ATX Characteristics
Minimum Input Operating. voltage
Maximum input Operating voltage
Deep-Discharge shutdown threshold
Input current limit (fuse protected)
Max Output Power
Deep Sleep Current Consumption.
Storage and operating temperature
MTBF
Efficiency (Input 10-16V)
Input connectors
Output Connector
*Unit shuts down when internal temperature sensor indicates > 85C. This value can be changed with software.
Maximum Power Characteristics
Output Rail
Current (Max)
5V
15A
3.3V
15A
5VSB
1.5A
-12V
0.15A
12V
12A (see below)
When operating at <8V or >28V or extreme temperatures, de-rate by 25-50%, ventilation might be required.
When operating at constant 160watts or more forced ventilation might be required.
12V Rail Output Current (12V buck/boost converter)
Input (V)
12V out current
6-8V
8A
8-11V
10A (12A peak)
Support and warranty: Standard Hardware Warranty 2 years EU.
M4-ATX User Guide
6V
30V (hard clamping will occur at 34V)
11.2V
Mini-blade 25A
250 Watts / 300 watts peak
< 1.6mA
-40 to +125 degrees Celsius (storage), -40 – 65C (operating)
200,000 Hrs
>95%, all rails combined, 50% load.
M4 screw terminal
ATX Power 24 pin (Molex P/N 39-01-2200)
Current Peak
(<30 seconds)
20A
20A
2A
0.2A
16A (see below)
Input (V)
12V out current
11-16V
12A (16A peak)
16-30V
12A (14A peak)
Page 4
Regulation
1.5%
1.5%
1.5%
10%
2%
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