Greener power supply IC optimises efficiency at all power levels

The TEA1533 switched-mode power supply IC from NXP Semiconductors implements three operating modes to maximise efficiency at high, medium and low power levels, allowing energy-using products to reduce consumption in all operating modes.

Quasi-resonant operation is implemented at high power levels, while fixed-frequency operation with valley switching is automatically invoked for medium-power operation. At low power levels, including when the equipment is in stand-by mode, reduced-frequency switching with cycleskipping maximises the power supply’s contribution to reducing overall losses. Zero-voltage switching in all operating modes further enhances efficiency.

Integrated features boost efficiency and save cost and footprint, including an on-chip current source supporting power-efficient direct start-up from the rectified AC input. Also integrated are frequency-control and power-on-reset circuitry, as well as device- and system-protection features. The input is able to operate directly from a rectified 70V-264V AC mains supply, further easing design and reducing overall part-count for globally-marketed products.

Designed for use with an external MOSFET, the TEA1533 serves applications up to 250W.

 

FEATURES Current-mode control Internally-generated reference voltage Safe-restart mode for system fault conditions Adjustable over-voltage protection Short-circuit-winding protection Over-current, over-power and overtemperature protection

APPLICATIONS Industrial equipment Process control Monitors and displays PC peripherals and networking equipment

 

 

www.nxp.com/pip/TEA1533P_TEA1533AP_2.html