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LLC converter maximizes power supply, minimizes footprint

Posted: 19 Sep 2011 ?? ?Print Version ?Bookmark and Share

Keywords:power? energy? converter?

Power Integrations LLC has introduced its new offering in the high-voltage integrated circuits industrythe HiperLCS family. This series of high-voltage LLC power supply IC incorporates MOSFETs, drivers and controller into a single low-cost package.

Highly integrated HiperLCS ICs optimize designs either for high efficiency (better than 97 percent) or size by leveraging high-frequency operation (up to 1MHz) to minimize transformer size and output capacitor footprint.

LLC converters have long been favored over other high-power topologies for applications such as PCs and server power supplies, TVs, and LED streetlights due to their high efficiency and ability to produce compact power supplies; however, using them for design is notoriously difficult. HiperLCS devices address this challenge by providing all of the required functions in a single ICeliminating up to 30 discrete and passive components in the processthereby streamlining the design cycle, saving board space, reducing assembly costs, and increasing reliability.

The high switching frequency of HiperLCS devicesallows designers to use low-cost SMD ceramic capacitors in the output loop instead of bulky, unreliable electrolytic capacitors, and reduces the size of the magnetics required. It also delivers excellent transformer utilization, with a peak switching frequency of 1MHz. Power Integrations' new thermally efficient, low-profile eSIP-16C package further contributes to space savings and reduces heat sink size.

HiperLCS devices have two modes of use. For high-efficiency design, itsresonant control circuitry provides very low power loss, allowing designs with efficiency greater than 97 percent at nominal 66kHz switching frequency. If cost and size are the determining design criteria, then high switching frequency is preferred. In this latter case, efficiency still remains highfor example, 96 percent at 250kHz, the frequency where maximum power is achieved.

Comments Chris Lee, product marketing manager at Power Integrations: "Designing LLC converters is a complex task. The biggest challenge is configuring all of the building blocks to eliminate cross conduction and controlling the various parasitic elements. With our new HiperLCSproduct family, the key components are contained inside a single IC and trimmed during manufacture to optimize the pairing of MOSFETs with drivers."

HiperLCS devices allow users to improve their designs by setting key circuit parameters, such as dead time and soft start, to provide optimum solutions. The design process is assisted by PI Xls, a real-time design and modeling tool that simplifies the job.

HiperLCS devices are now available in new, low-profile eSIP-16C packages starting at $2.28 each for 10,000-piece quantities (LCS700).

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