Single-chip resonant converter helps meet sub-1W standby power

The FSFR2100 Green FPS™ power switch from Fairchild Semiconductor reduces the environmental impact of power supplies for consumer and professional products by increasing efficiency, saving components and heatsinks and easing design.

The FSFR2100 helps designers implement low-loss, high-frequency resonant converters by integrating a Pulse-Frequency-Modulation (PFM) controller, high-voltage gate driver, two fast-recovery MOSFETs and protection circuitry to save board space and part count. All resonant converter topologies are supported, including series, parallel and LLC converter designs operating at switching frequencies up to 300kHz.

Special features include pulse skipping at light loads, enabling end products to meet growing worldwide demand for sub-1W standby power. Pulse skipping is invoked via an external Control pin, which can also be used as an on/off input and to trigger protection modes.

By supporting Zero Voltage Switching (ZVS), the FSFR2100 further improves efficiency and reduces electromagnetic emissions to save heatsink and filter requirements. The device can operate at up to 200W without a heatsink.

 

FEATURES 450W maximum power Soft-start function 350ns fixed dead-time Auto-restart and latch-mode protection functions 9-pin SIP package

APPLICATIONS Telecom power supplies Servers Desktop PCs Power adapters TV and audio equipment

 

 

 

See Design Note on page 080520.

 

Fairchild FSFR2100 Power Switch