SG6901A Overview
The highly integrated SG6901A is designed for power supplies with boost PFC and flyback PWM. It requires Product Specification very few external ponents to achieve versatile protections. It is available in a 20-pin SOP package. The patented interleave-switching feature synchronizes the PFC and PWM stages and reduces switching noise. 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, the SG6901A shuts off PFC to prevent extra-high voltage on output. Programmable two-level output voltage control reduces the PFC output voltage at low line input to increase the efficiency of the power supply. For the flyback PWM, the synchronized slope pensation ensures the stability of the current loop under continuous-conduction-mode...
SG6901A Key Features
- Interleaved PFC/PWM switching
- Low start-up and operating current
- Innovative switching charge multiplier-divider
- Multi-vector control for improved PFC output
- Average-current-mode control for PFC
- Programmable two-level PFC output voltage
- PFC over-voltage and under-voltage protections
- PFC and PWM feedback open-loop protection
- Cycle-by-cycle current limiting for PFC/PWM
- Slope pensation for PWM
