The highly integrated SG6980 is designed for power supplies with boost power-factor-correction (PFC). It requires very few external components to achieve desirable operation and includes versatile protections / compensation. It is available in 16-pin DIP and SOP packages. The innovative switching-charge multiplier divider enhances the PFC circuit’s noise immunity. 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, SG6980 shuts off to prevent extra-high voltage on output. The PFC gate driver can be synchronized with external SYNC signal and the switching noise can be reduced. During start-up, the RDY (ready) is pulled low until the PFC output voltage reaches the setting level. This signal can be used to control the second forward stage for proper power-on sequence. In addition, SG6980 provides complete protection functions, such as brownout and RI open/short.

• Innovative switching-charge multiplier divider
• Multi-vector control for improved PFC output transient response
• 1:1 Synchronous switching with SYNC
• Average current mode control
• Remote on/off control
• Power-on sequence control
• Programmable PFC output-voltage control
• Cycle-by-cycle current limiting
• Over-voltage and under-voltage protections
• Brownout and open-loop protections
• Low start-up and operating current

• Active-PFC switching power supplies
• TV and home appliances
• Computer and telecom