FSFR1800HS: Advanced Integrated Power Switch (FPS™) for 260W Half-Bridge Resonant Converter

The FSFR-HS is a highly integrated power switch designed for high-efficiency half-bridge resonant converters. Offering everything necessary to build a reliable and robust resonant converter, the FSFR-HS simplifies designs while improving productivity and performance. The FSFR-HS combines power MOSFETs, a high-side gate-drive circuit, an accurate current-controlled oscillator, and built-in protection functions.

The high-side gate-drive circuit has a common-mode noise cancellation capability, which provides stable operation with excellent noise immunity. Using zero-voltage-switching (ZVS) technique dramatically reduces the switching losses and significantly improves efficiency. The ZVS also reduces the switching noise noticeably, even though the operating frequency increases. It allows a small Electromagnetic Interference (EMI) filter, besides the high operating frequency, to reduce the volume of the resonant tank and to increase power density.

The FSFR-HS can be applied to resonant converter topologies such as series resonant, parallel resonant, and LLC resonant converters.

Features

• Variable Frequency Control with 50% Duty Cycle for Half-Bridge Resonant Converter Topology
• High Efficiency through Zero Voltage Switching (ZVS)
• Built-in High-Side Gate Driver IC
• Internal UniFET™s with Fast-Recovery Type Body Diode (t_rr=160ns Typical)
• Fixed Dead Time (350ns) Optimized for MOSFETs
• Operating Frequency Up to 600kHz for Soft-Start
• Self Auto-Restart Operation for All Protections, Despite External LV_CC Bias
• Line UVLO with Programmable Hysteresis Level
• Simple On/Off with Line UVLO Pin
• Easy Configuration and Compatibility with FAN7930 for Line UVLO without External Components
• Protection Functions: Over-Voltage Protection (OVP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD)

Application Notes