The highly integrated SG6932 is designed for power supplies with boost PFC and forward PWM. It requires very few external components to achieve versatile protections and compensation. It is available in 16-pin DIP and SOP packages.

The proprietary interleave-switching feature synchronizes the PFC and PWM stages and reduces switching noise. At light load, the switching frequency is continuously decreased to reduce power consumption.

For PFC stage, the proprietary multi-vector control scheme provides a fast transient response in a low-bandwidth PFC loop; in which the overshoot and undershoot of the PFC voltage are clamped. If the feedback loop is broken, SG6932 shuts off to prevent extra-high voltage on output.

For the forward PWM stage, the synchronized slope compensation ensures the stability of the current loop under continuous-conduction-mode (CCM) operation. Hiccup operation during output overloading is guaranteed. The soft-start and programmable maximum duty cycle ensure safe operation.

SG6932 provides complete protection functions, such as brownout protection and RI open/short latch off

• Interleaved PFC / PWM Switching
• Low Operating Current
• Innovative Switching-Charge Multiplier-divider
• Multi-vector Control for Improved PFC Output Transient Response
• Average Current Mode for Input-current Shaping
• PFC Over-voltage and Under-voltage Protections
• PFC and PWM Feedback Open-loop Protection
• Cycle-by-cycle Current Limiting for PFC/PWM
• Slope Compensation for PWM
• Selectable PWM Maximum Duty Cycle: 50%, 65%
• Brownout Protection
• Power-on Sequence Control and Soft-start

• Switch-mode Power Supplies with Active PFC
• Servo-system Power Supplies
• PC-ATX Power Supplies