This wall mounted 5V 3A switch mode power supply transformer provides a high-power-density and cost-effective solution for a variety of application field. The ac to dc voltage transformer operates at a high switching frequency to achieve high efficiency in all load conditions, with an extremely low total standby consumption and low output ripple and nose. The switching power supply 5V 3A is equipped with full protection functions to improve the reliability including OCP, OVP, OLP. Efficient thermal management enhances reliability further, allows the 5V DC power supply to operate at full power at higher ambient temperatures.