Off-line switcher IC delivers higher energy efficiency

9 May 2001 Power Electronics / Power Management

Power Integrations' energy efficient, low power off-line switcher IC family, named TinySwitch-II, maintains the simplicity of the company's previous TinySwitch line while providing additional features and lowering system cost. According to the company, the output power capability has also been increased to 23 W (15 W with a universal input), making it an energy efficient solution addressing most standby power requirements.

The family of monolithic ICs integrates a high voltage Power MOSFET, oscillator, and control circuitry onto a single CMOS chip. It consists of eight part types ranging in power levels from 4 to 23 W. Built-in features include auto-restart for short circuit and open loop fault protection, frequency jittering for low EMI filtering cost, current limit and thermal protection, programmable line undervoltage detection preventing power on/off glitches, circuitry to eliminate audible transformer noise, and very tight tolerances with negligible temperature variation on key parameters, simplifying design and lowering system cost. Additionally, the internal switching frequency of 132 kHz reduces transformer size and allows the use of lower cost EF12.6 or EE13 cores.

The family incorporates the company's EcoSmart technology to reduce energy consumption under 'no-load' power conditions.

Impact Memec, (011) 897 8600

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