Switcher ICs deliver high accuracy in non-isolated off-line applications

Power Integrations has launched introduced its LinkSwitch-TN2 off-line switcher for

IC for non-isolated applications with up to 360 mA output current.

The new device, which can be configured as a buck, buck-boost or a non-isolated flyback converter, is said to deliver high accuracy, high efficiency and excellent no-load performance. It incorporates new safety features including input and output over-voltage protection and a rugged MOSFET with a 725V breakdown voltage, offering robust output short-circuit and over-temperature protection against line surges and swells. According to the company, the MOSFET allows a typical design to easily withstand 1kV differential line surges without additional surge suppressors.

Target applications include appliances, HVAC, industrial, home automation (IoT) and metering systems, particularly those destined for India and other geographies with challenging power grid stability.

LinkSwitch-TN2 ICs feature voltage regulation of better than -/+ three per cent. This level of accuracy allows designers to eliminate post regulators, minimising the BoM, increasing efficiency and reducing size. The new IC requires just 20 additional components to complete a buck converter, and may be configured to use off-the-shelf inductors, further reducing cost and supply chain complexity.

The ICs are efficient in low-power applications– above 80 per cent in 12V, 120mA (1.4W) buck designs for example. LinkSwitch-TN2 designs typically provide excellent efficiency across the entire load range while consuming less than 30mW no-load in a buck arrangement and less than 10mW when configured as a non-isolated flyback. This is a key tool for designers addressing total energy consumption (TEC) regulations, which prescribe an energy budget limit over a range of operating modes. LinkSwitch-TN2 efficiency performance enables manufacturers to design power supplies to meet worldwide product energy-efficiency requirements from the US DoE to the European Commission ErP Ecodesign Directive, and from California Energy Commission to Energy Star.

The off-line converter ICs include a selectable cycle-by-cycle current limit which allows designers to choose low-cost inductors and capacitors saving cost and board space, or configure the circuit to output higher power using optimised external components.

LinkSwitch-TN2 ICs come in three different packages: PDIP-8C, SO-8C, and SMD-8C.



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