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Power Integrations offers replacement for regulated linear transformer

Posted: 30 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:power integrations? switching power supply? linkswitch-hf? power conversion ic? power conversion?

Power Integrations Inc. disclosed that it has developed a new product family that enables cost-effective switching power supplies for low power applications requiring tight output regulation.

According to the company, its new LinkSwitch-HF devices offer designers a low cost and very energy-efficient replacement for regulated linear transformer and discrete power supply designs. These ICs are targeted at battery chargers and appliances that require fault protection and accurate control of output voltage and current. By eliminating the separate bias winding on the power supply transformer, system component cost is reduced compared to competitive switcher designs, said Power Integrations.

Additionally, switching characteristics of the products' integrated high voltage MOSFET have been optimized to reduce electro-magnetic interference (EMI), allowing conformance to international emission standards. A power supply design with very low line-frequency leakage current is possible, allowing safe use of a metal-encased mobile phone during battery charging.

The LinkSwitch-HF integrates a 700V power MOSFET, oscillator with simple on/off control, high voltage start-up, cycle-by-cycle current limit, hysteretic thermal shutdown, and auto-restart circuitry unto a single CMOS chip. The press release said that tight tolerances and negligible temperature variation on key parameters ease design and lower system cost. A 200kHz switching frequency allows transformer designs with low flux density, and the frequency jittering minimizes EMI filter cost.

The new product family also incorporates the company's EcoSmart technology that reduces energy waste in standby and no-load conditions. In a standard ac-dc flyback configuration, a LinkSwitch-HF design will consume <300mW while in no-load.

Design support includes a data sheet, an application note (AN-38), a Reference Design Kit (DAK-73) containing an operational 2.3W universal input ac-dc power supply and product samples, and the company's power supply design software programPI Expert.

Members of the LinkSwitch-HF family are available in plastic through-hole DIP-8 and surface-mountable SMD-8 packages. Pricing in 1,000-piece quantities for the LNK353P, a 4W part in a DIP 8 package, is 47 cents each. Meanwhile, the LNK354P, a 5W part, is priced at 50 cents each. Small quantities of each type are available from stock, with production quantities available 4 weeks ARO.

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