Aitech P226

Introduction

Designed for harsh environment applications, the Aitech P226 is a versatile and reliable 6U VME power supply providing VME systems with an exceptionally wide input voltage range to assure excellent load and line regulation.

Input power can vary from 16 to 36 Vdc, with a drop to 14 Vdc for up to 45 seconds and 12 Vdc for 3 seconds. For EMI reduction, an input line filter is used to reduce the input reflected ripple.

The power supply outputs four VME64x compliant voltages, each featuring a holdup time of 4 ms (50 ms holdup time with optional capacitor bank module). The four outputs are provided by four DC-to-DC converters, with a total power rating of up to 300 W, and minimum of 500 V isolation from input to output, thus eliminating any possibility of ground loops.

All outputs are individually protected against short-circuit and overvoltage. The power supply asserts all three VME 64x control signals - SYSRST, SYSFAIL and ACFAIL. All output voltages have sense lines to ensure voltage stability for high current loads.

The power supply includes a fan control circuit to control and monitor the operation of a 28 Vdc cooling fan. A temperature monitoring and control circuit controls fan operation, issues an alarm to indicate power supply over temperature, and shuts the power supply off if temperature reaches damaging levels. In addition, the P226 is equipped with sophisticated BIT logic that monitors inputs and outputs, temperature, and fan status, and provides the VME and BIT status signals.

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, indicating proper output voltages and power supply status.