Manufacturer: Aitech

Designed for harsh environment applications, the Aitech P228 is a versatile and reliable 6U power supply providing rugged systems with an exceptionally wide input voltage range (18 - 32Vdc) to ensure excellent load and line regulation. For EMI reduction, an input line filter is used to reduce the input reflected ripple.

The power supply outputs four common voltages for VME, VPX and CompactPCI systems, with a total combined output capacity of 500 watts. Holdup time at the full rated output is 2ms (25 ms with optional capacitor bank module).

All output voltages have sense lines to ensure voltage stability for high current loads. Furthermore, all outputs are individually protected against short-circuit and overvoltage.

The P228 features 500V isolation from input to output, thus eliminating any possibility of ground loops.

The power supply includes a fan control circuit to control and monitor the operation of a cooling fan. The circuit includes voltage regulation to maintain constant fan power, regardless of supply voltage and load, to ensure maximum fan RPM. A temperature monitoring and control circuit controls fan operation, issuing an alarm to indicate power supply over-temperature, and shutting the power supply off if the temperature reaches damaging levels. In addition, the P228 is equipped with sophisticated BIT logic that monitors inputs and outputs, temperature, and fan status, and provides BIT and status signals (SYSRST, SYSFAIL and ACFAIL).

Three discrete inputs enable the power supply and the fan to be turned on and off remotely. Eight indicator LEDs provide a convenient visual indication of power supply status.


InputInput range: 18 - 32Vdc
Overvoltage Protection [Vdc]: Up to 50
Reverse Polarity Protection [Vdc]: Up to 50
Transient suppression: Per MIL-STD 704A/D/E/F and 1275 (non-damage with a minimum voltage of 18Vdc)
Output(s)Total Combined Output: Capacity 600W
• 12V: 5A
• +5V: 60A
• +3.3V: 25A
• -12V: 5A
Efficiency88% efficiency (depending on load and distribution)
Isolation>10 MOhm at 100 V Input to Chassis
>10 MOhm at 100 V Output to Chassis
>10 MOhm at 500 V Input to Output


MechanicalWithout Holdup Capacitor Bank: 233.35 mm (H) x 160 mm (D) x 23.2mm (width)
With Holdup Capacitor Bank: 233.35 mm (H) x 160 mm (D) x 39.3mm (width)
Conformal CoatingAs standard (Acrylic but Urethane option)
TemperatureTemperature range Rugged (operation): -40 to +71°C
Temperature range Rugged (storage): -60 to +100°C
Temperature range Military (operation): -40 to +85°C
Temperature range Military (storage): -60 to +100°C
Humidity5 - 95% relative humidity
Weight1415g (without optional capacitor bank module)
1890g (with optional capacitor bank module)
AltitudeUp to 50,000 ft
VibrationRandom (maximum 0.1 g²/Hz at 20 - 2kHz, with a total of 8 grms
ShockSingle shocks, operating - 40g peak, half-sine, 11 ms, in 3 axes.
Warranty1 Year
Recab UK
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