Half Bridge resonant SMPS capable of delivering 800W continuous and 1000W peak power. the stock available output voltages are +-32V, +-40V, +-50V, +-60V and +-72V. It uses zero-voltage switching half bridge resonant topology. The main advantage is lower size and cost compared with a similar regulated SMPS and better efficiency, up to 95% compared with the regulated SMPS's due to the fact that the transistors are soft-switched, and the current through the switches has sinusoidal shape, and there are no output inductors. The SMPS features overcurrent protection which limit the output current at about 120% of the peak power, about 1050W. The mains supply voltage can be set for either 110V or 230V. This power supply is suitable for both class AB and class D/T amplifiers, which have the PSRR greater or at least 54dB. Target applications for this power supply unit include the TA3020 based amplifiers and IRS2092 amplifiers for the +-50V and +-60V version and multiple TDA8950 or TA2022 amplifiers for the +-32V or +-40V version. In addition to the main differential output voltage, an auxiliary regulated differential voltage is available, with the following voltages +-5V at 500mA +-12V at 500mA or +-15V at 400mA. The auxiliary voltages are galvanically isolated from the main output voltages, and the Aux. GND can be referenced at any main output potential. The Power Supply has on-board Mains IEC Power Connector, which allows easier installation without using other mains cables than the ones for the mains switch. For operation inside a tight case, an optional variable speed cooling fan is available, which should be used when the Power Supply delivers high power for long periods of time. The overall size of the Power Supply is 150mm long, 100mm wide and 38mm tall, which makes it suitable to be used in 1 RU cases, with an overall height of maximum 43mm including spacers.