Chipset Boosts LLC Converter Efficiency, Slashes Component Count by 40 Percent


Surface-mount LLC chipset delivers 250 W with over 98 percent efficiency and no heatsink

Power Integrations announced the energy-saving HiperLCSTM-2 chipset, a new IC family that dramatically simplifies the design and manufacture of LLC resonant power converters. The new dual-chip solution features an isolation device with a high-bandwidth LLC controller, synchronous rectification driver and FluxLinkTM isolated control link, alongside a separate half-bridge power device utilizing Power Integrations’ unique 600 V FREDFETs with lossless current sensing and high- and low-side drivers. Both devices are housed in low-profile InSOPTM-24 packages. This highly integrated, energy-efficient architecture eliminates heatsinks and reduces component count by up to 40 percent compared to discrete designs.

Resonant converters are typically used wherever an application demands a level of efficiency unachievable with single-switch topologies such as flyback converters. The HiperLCS-2 chipset leverages Power Integrations’ high-speed FluxLink feedback mechanism to avoid the compromises normally associated with the LLC topology, permitting designers to quickly and consistently implement designs with high performance, wide operating range and low component count.

Power supply designs based on the new HiperLCS-2 can achieve no-load input power of less than 50 mW at 400 VDC input and provide a continuously regulated output, easily complying with the world's most stringent no-load and standby efficiency regulations. HiperLCS-2 devices operate at high efficiency across the load range with dissipation so low that direct heat transfer through the FR4 PCB is all that is required, eliminating heatsinks in adapter designs up to 220 W continuous output with up to 170 percent peak power capability. All HiperLCS-2 family members feature self-powered start-up and provide the start-up bias for a PFC stage using the company’s HiperPFSTM ICs. Secondary-side sensing provides less than one percent regulation accuracy across line and load range and across production variations. The use of Power Integrations’ FluxLink technology for safety-isolated high-speed digital feedback control provides much faster transient response and far superior long-term reliability compared to optocouplers.

Availability & Resources

A reference design, DER-672, is available to download for designers who want to evaluate HiperLCS-2 ICs. Pricing for the HiperLCS-2 starts at $3.20 per chipset in 10,000 unit quantities. For more information, please go here