Power-supply converter IC integration cuts component counts

November 14, 2013 // By Graham Prophet
Power Integrations’ high-frequency two-switch-forward IC – a main-converter device that forms the core of a switching power supply – reduces system cost and footprint; higher switching speed and increased integration yield smaller magnetics, and cut component count

Power Integrations' HiperTFS-2 family of ICs combines two-switch-forward and flyback power-supply controller ICs with integrated high-voltage MOSFETs. This high level of integration saves more than 20 components, resulting in a smaller form factor and higher power density. The main converter provides a selectable switching frequency between 66 kHz and 132 kHz, which reduces system cost by enabling the use of very small magnetics.

HiperTFS-2 ICs enable efficiencies of more than 90% at full load. They also provide 175% peak power, a requirement of next-generation Intel CPUs. This single-chip implementation of a two-switch-forward main (66/132 kHz) and flyback (132 kHz) standby power supply delivers up to 364W total output power (586W peak) in a compact, two-row eSIP power package. Safety features include undervoltage, overvoltage, over-temperature, overcurrent and short-circuit protection. A transformer-reset control function prevents saturation under all conditions.

PI says that HiperTFS-2 ICs enable power supply miniaturisation in applications including 80 PLUS Bronze and 80 PLUS Silver PCs, gaming-console adapters and industrial products. The inclusion of the high-side MOSFET driver allows designers to eliminate the pulse transformer and many other supporting components, simplifying design and reducing the size (and cost) of the magnetics. The device costs $1.74 (10,000).

A reference design based on the HiperTFS-2 IC, DER368, describes a 12V, 180W power supply with 250W peak power load and 10W standby power – see; www.powerint.com/sites/default/files/PDFFiles/der368.pdf

Power Integrations; www.powerint.com