PSD-45 45W DC-DC Switching Power Supplies MEAN WELL PSD-45 Series 45W DC-DC Switching Power Supplies feature a single output, 2:1 wide input range, built-in EMI filter, low ripple noise and a fixed switching frequency at 96KHz. MEAN WELL designed the PSD-45 Power Supply with short circuit, over load, over voltage, and polarity protections. The low-cost switching power supply is highly reliable and offers a 2-year warranty.