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Design guide for switcher IC

Posted: 13 Apr 2009     Print Version  Bookmark and Share

Keywords:Topswitch-HX  off-line switcher IC  over-voltage protection 

The Topswitch-HX is a highly integrated monolithic off-line switcher IC designed for off-line power supplies. Topswitch-HX integrated circuits enable design of power supplies up to 195 W, while providing high efficiency under all load conditions, claims Power Integrations.

The Topswitch-HX family allows the designer to meet the efficiency requirements for the new energy-efficiency standards. Innovative and proprietary features enable design of compact and cost effective switching power supplies while reducing overall design cycle time and system cost, says Power Integrations. The Topswitch-HX family also enables the design of power supplies and provides safety features such as output over-voltage protection, overload power limiting and hysteretic thermal protection.

Each member of the family has a high-voltage power MOSFET and its controller combined monolithically. Internal start-up bias current is drawn from a high-voltage current source connected to the DRAIN pin, eliminating the need for external start-up circuitry. The internal oscillator is frequency modulated (jitter) to reduce EMI. The auto-restart function limits power dissipation in the MOSFET, the transformer and the output diode during overload, output short-circuit or open-loop conditions. The auto-recovering hysteretic thermal shutdown function also disables MOSFET switching if temperature exceeds safe limits.

View the PDF document for more information.

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