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SG6901A

System General
Part Number SG6901A
Manufacturer System General
Description PFC / Flyback PWM Controller
Published Feb 18, 2020
Detailed Description PFC / Flyback PWM Controller FEATURES OVERVIEW „ Interleaved PFC/PWM switching „ Low start-up and operating current „ In...
Datasheet PDF File SG6901A PDF File

SG6901A
SG6901A

Overview
PFC / Flyback PWM Controller FEATURES OVERVIEW „ Interleaved PFC/PWM switching „ Low start-up and operating current „ Innovative switching charge multiplier-divider „ Multi-vector control for improved PFC output transient response „ 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 compensation for PWM „ Constant power limit for PWM „ Brownout protection „ Over-temperature protection (OTP) APPLICATIONS „ Switching Power Supplies with Active PFC and Standby Power „ High-Power Adaptors DESCRIPTION The highly integrated SG6901A is designed for power supplies with boost PFC and flyback PWM.
It requires Product Specification SG6901A very few external components 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 compensation ensures the stability of the current loop under continuous-conduction-mode operation.
Built-in line-voltage compensation maintains constant output-power limit.
Hiccup operation during output overloading is also guaranteed.
In addition, SG6901A provides protection functions, such as brownout and RI pin open/short protection.
Typical Application © System General Corp.
Version 1.
0.
1 (IAO33.
0062.
B0) - 1 - www.
sg.
com.
tw • www.
fairchildsemi.
com September 26, 2007 PFC / Flyback PW...


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