New 900V switcher ICs eliminate need for heat sinks

Power Integrations, maker of high-voltage integrated circuits for energy-efficient power conversion, has released a new line of flyback switcher ICs that are suitable for high-voltage power supplies.

The 900V version of its InnoSwitch-EP off-line CV/CC flyback switcher ICs continuously operate during line swells and surges, and are thus suitable for power supplies operating from high-voltage DC and three-phase power sources found in industrial, motor-drive, metering and renewable energy applications.

The 900V InnoSwitch-EP ICs deliver an efficient 85% for a dual output 18W design, eliminating heat sinks and enabling highly compact power supply implementations.

"Designers of high-voltage systems often have megawatts of power at their disposal, from which they may need to draw off a few milliwatts to feed a low-voltage microprocessor system, or a few tens of watts for inverter gate drivers. The new 900V InnoSwitch-EP devices drastically simplify the design of robust highly reliable power supplies operating from commonly available industrial voltages," said David Chen, director of applications engineering at Power Integrations

Launched last year, the InnoSwitch-EP IC family employs the company's innovative, safety-rated FluxLink magneto-inductive coupling technology and includes synchronous rectification with accurate secondary-side regulation. This results in efficient, reliable power supply circuits that do not need an optocoupler. The new 900V InnoSwitch-EP ICs feature an uprated, integrated 900V power MOSFET, which provides a significant operating margin for 450VAC industrial systems, increasing reliability and operational life. Working continuously with an input voltage of up to 450VAC, an optional layer of protection – line UV/OV – prevents the IC from switching and protects the circuit up to 650VAC.

The 900V InnoSwitch-EP ICs enhance power-supply reliability by reducing BOM count to a minimum level and by eliminating optocouplers, which degrade with time. Devices exceed all international energy-efficiency standards such as ENERGY STAR, California Energy Commission and European Union Code of Conduct (CoC), ErP Directive, and the US Department of Energy standards. Devices are UL1577 and TUV (EN60950) safety-approved and EN61000-4-8 (100 A/m) and EN61000-4-9 (1000 A/m) compliant.

The 900V InnoSwitch-EP samples are available now. Devices are priced at $0.95 in 10,000-piece quantities. Reference design, DER-531, is available from the Power Integrations website at www.power.com/innoswitch-ep.