System-in-a-package approach to efficient resonant converters

The FSFR2100 integrated Green FPS™ power switch offered by Fairchild Semiconductor takes a system-in-apackage approach to building reliable and efficient resonant converters.

This power switch integrates a Pulse-Frequency- Modulation (PFM) controller with a high-voltage gate-driver circuit and two Fast Recovery MOSFETs (FRFET®) along with soft-start, burst operation and protection features into a thermally-efficient 9-SIP package. The combined integration of the FSFR2100 results in increased power efficiency, improved system reliability, and reduced design time for resonant converters.

The FSFR2100 features a Zero Voltage Switching (ZVS) technique that dramatically reduces switching losses in MOSFETs and rectifiers. With this technique, this power switch can handle up to 200W without a heat sink and up to 450W with a heat sink. Compared to conventional hard-switch converter topologies, efficiency is improved by 10%, and for applications such as PDP-TVs, efficiency reaches 97%. An additional advantage of this ZVS technique is that switching noise is reduced. Offering burst operation function, the FSFR2100 brings standby power consumption below 1W to easily comply with the industry’s 1 Watt Initiative.

 

FEATURES Variable frequency control with 50% duty cycle for half-bridge resonant converter topology Internal super-FETs with fast-recovery body diode: 120ns reverse recovery time 350ns fixed dead time optimised for MOSFETs <300kHz operating frequency Pulse skipping for frequency limit Remote on/off using control pin Protection functions: Over-Voltage Protection (OVP) Overload Protection (OLP) Over-Current Protection (OCP) Abnormal Over-Current Protection (AOCP) Internal Thermal Shutdown (TSD)

APPLICATIONS PDP TV and LCD TV Desktop PC and server Adapter Telecom power Audio power

 

 

 

• Zetex Semiconductors ZXCT1080, page 080309

 

Fairchild Semiconductor/FSFR2100

 

 

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