Power Integrations’ New HiperTFS Incorporates Efficient Two-Switch-Forward Main and Flyback Standby Power Converters into Single IC

As well as the two controllers, HiperTFS devices include high- and low-side drivers and all of the high-voltage power MOSFETs for the main and standby power converters. Therefore, HiperTFS is an ideal product for consumer, computer, and industrial power supply designs requiring main power from 120 W to 415 W and a standby converter capable of up to 20 W. The new devices particularly target applications requiring high efficiency and compact form factor, such as desktop PCs, TVs, and video game consoles.

Two-switch-forward power converters are often selected for applications demanding cost-effective efficiency, fast transient response, and accurate tolerance to line voltage fluctuation. The two-switch-forward controller incorporated into HiperTFS devices improves on the classic topology by allowing operation considerably above 60% duty cycle. This improvement reduces RMS currents - and therefore conduction losses - and also minimizes the size and cost of the bulk capacitor. The advanced design also includes transformer flux reset control and charge-recovery switching of the high-side MOSFET, which reduces switching losses. This combination of innovations yields an extremely efficient power supply with smaller MOSFETs, fewer passives and discrete components, and a lower-cost transformer.

HiperTFS also includes a 20 W flyback standby controller and MOSFET based on the highly popular TinySwitch technology used in billions of power converter ICs due to its simplicity of operation, light load efficiency, and rugged, reliable, performance.

Comments David New, product marketing manager at Power Integrations: “HiperTFS enables engineers to build power supplies that cost-effectively meet current and emerging power efficiency standards, such as 80 PLUS Bronze for PCs and the new mandatory California Energy Commission efficiency regulations for televisions. With its high level of integration, supported by comprehensive design software, HiperTFS simplifies design efforts and enables engineers to quickly develop high-power power converters. We have brought the advantages of integration to applications below about 50 W for many years; now, high-power products can also benefit from the simplicity, reliability, compactness, and cost savings of a single-chip approach.”

HiperTFS products include Power Integrations’ standard set of comprehensive protection features, such as integrated soft-start, fault and over-load protection, and hysteretic thermal shutdown. HiperTFS devices are available now in PI’s popular, grounded-tab, eSIP-12 power package and are priced from $2.38 each for 10,000-piece quantities. The product datasheet, design ideas, and introductory video are available now on the Power Integrations website at www.powerint.com/hipertfs.