FSFA2100: Integrated Power Switch (FPS™) for 450W Half-bridge Asymmetric Converter

The growing demand for higher power density and low profile in power converter designs has forced designers to increase switching frequencies. Operation at higher frequencies considerably reduces the size of passive components, such as transformers and filters. However, switching losses have been an obstacle to high-frequency operation. To reduce switching losses and allow high-frequency operation, Pulse Width Modulation (PWM) with soft-switching techniques have been developed. These techniques allow switching devices to be softly commutated, which dramatically reduces the switching losses and noise.

FSFA2100 is an integrated PWM controller and SuperFET® specifically designed for Zero-Voltage-Switching (ZVS) half-bridge converters with minimal external components. The internal controller includes an oscillator, under-voltage-lockout, leading-edge blanking (LEB), optimized high-side and low-side gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation and self-protection circuitry. Compared with discrete MOSFET and PWM controller solution, FSFA2100 can reduce total cost; component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability.

Features

• Optimized for Complementary Driven Half-Bridge Soft-Switching Converters
• Can be Applied to Various Topologies: Asymmetric PWM Half-Bridge Converters, Asymmetric PWM Flyback Converters, Asymmetric PWM Forward Converters, Active Clamp Flyback Converters
• High Efficiency through Zero-Voltage-Switching (ZVS)
• Internal SuperFET®s with Fast-Recovery Type Body Diode (trr=120ns)
• Fixed Dead Time (200ns) Optimized for MOSFETs
• Up to 300kHz Operating Frequency
• Internal Soft-Start
• Pulse-by-Pulse Current Limit
• Burst-Mode Operation for Low Standby Power Consumption
• Protection Functions: Over-Voltage Protection (OVP), Over-Load Protection (OLP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD)

Application Notes