Power Integrations Expands DC-DC Converter IC Family for Power over Ethernet Applications

March 25, 2004
Highly Integrated DPA-Switch™ Simplifies DC-DC Converter Designs

SAN JOSE, Calif. - March 25, 2004 - Power Integrations (NASDAQ: POWI), a leading supplier of high-voltage power conversion ICs, announced today the availability of six new part types in its DPA-Switch family of integrated circuits for DC-DC power conversion. Available in low cost 8-pin plastic DIP and surface mount packages, the new devices lower power converter system cost and dramatically simplify DC-DC power conversion designs in an expanded range of applications, including Power over Ethernet (PoE) Powered Devices (PDs) compliant to IEEE standard 802.3af. The DPA Switch family, including the earlier introduced TO-263 packaged devices, enables a cost effective, scalable solution capable of delivering up to 100 W of continuous output power. They are ideally suited to PDs over the full PoE power range (0.44 W to 12.95 W) such as VoIP phones, wireless access points and network cameras.

The DPA Switch family, named for its compatibility with Distributed Power Architectures (DPAs), operates over a wide input voltage range (16 V to 75 V). The ICs cost-effectively integrate a 220 V high frequency power MOSFET, PWM control, fault protection and other control circuitry on one CMOS chip. High performance features include built-in soft-start, selectable 300 kHz or 400 kHz switching frequency, cycle skipping at light load for high standby efficiency, and internal hysteretic thermal shutdown. All critical parameters have tight temperature and absolute tolerance to simplify design and optimize system cost. The devices in this family can be used in both flyback and single-ended forward topologies and are compatible with any self-driven synchronous rectification (SDSR) scheme to boost efficiency in low voltage, high current applications. The ICs can eliminate over 20 external components compared to a typical discrete MOSFET plus PWM controller DC DC converter design, resulting in shorter design cycles, smaller board sizes, lower system cost, and higher reliability.

Other applications for the DPA-Switch include networking and telecommunication line cards (central office equipment including xDSL, ISDN, and PABX), "brick" DC-DC converter modules, digital feature phones, and industrial controls.

The product family is supported by a number of design tools, including a comprehensive data sheet and Application Note (AN-31). Two new Design Accelerator Kits (DAK-68 and DAK-71) are also available, each containing an operational DC-DC converter reference design, an engineering report, product samples, and additional design collateral. DAK-68 includes a 6.6 W, 2 A DC-DC converter with a PD interface circuit, while DAK-71 offers a 6.6 W, 2 A generic DC-DC converter. Additional support tools include application circuits for VoIP and PoE applications (DI-69 and DI-70) and the company's power supply design software program, PI Expert™.

Pricing for the new plastic DIP DPA-Switch devices in 1,000 piece quantities ranges from $1.00 each for the DPA423P, a 13 W through-hole part, to $1.75 each for the 52 W rated surface mount packaged DPA425G. Production quantities are available 6 weeks ARO.

Power Integrations is a leading supplier of high-voltage analog integrated circuits for use in AC-DC and DC-DC power conversion. For more information, contact the company at 5245 Hellyer Avenue, San Jose, California 95138, PH: (408) 414-9200 or visit the company's web site at www.powerint.com. For information on meeting energy regulations, visit Power Integrations' Green Room at www.powerint.com/greenroom.

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