This wall mounted AC DC adapter 9V 0.5A is a primary side universal regulated switching power supply that provides a high-power-density and cost-effective solution for a variety of application field without optocoupler and secondary control circuitry. The 9V regulated switching power supply operates at a high switching frequency to achieve high efficiency in all load conditions, with an low total standby consumption and low output ripple and noise. Full protection functions improve the reliability including OCP, OVP, OLP, and effective thermal management enhances reliability further, allows the 9V power supply to operate at full power at high ambient temperatures. We also carry primary side regulation (PSR) switching adapter 9V 3A /2A /1A which can provide first-class regulation at competitive price.