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SG6901A

Fairchild Semiconductor
Part Number SG6901A
Manufacturer Fairchild Semiconductor
Description CCM PFC/Flyback PWM Combination Controller
Published Feb 20, 2009
Detailed Description SG6901A — CCM PFC / Flyback PWM Combination Controller February 2009 SG6901A CCM PFC/Flyback PWM Combination Controlle...
Datasheet PDF File SG6901A PDF File

SG6901A
SG6901A

Overview
SG6901A — CCM PFC / Flyback PWM Combination Controller February 2009 SG6901A CCM PFC/Flyback PWM Combination Controller Features ƒ Interleaved PFC/PWM Switching ƒ Low Startup and Operating Current ƒ Innovative Switching Charge Multiplier Divider ƒ Multi-vector Control for Improved PFC Output Transient Response ƒ Average-Current-Mode Control for PFC ƒ Programmable Two-Level PFC Output Voltage Protections ƒ PFC and PWM Feedback Open-Loop Protection ƒ Cycle-by-Cycle Current Limiting for PFC/PWM ƒ Slope Compensation for PWM ƒ H/L Line Over-Power Compensation for PWM ƒ Brownout Protection ƒ Over-Temperature Protection (OTP) Applications ƒ Switching Power Supplies with Active PFC and Standby Power ƒ High-Power Adaptors Description The highly integrated SG6901A is designed for power supplies with boost PFC and flyback PWM.
It requires very few external components to achieve versatile protections.
It is available in a 20-pin SOP package.
A proprietary 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 lowbandwidth 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.
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 outputpower limit.
Hiccup operation during output overloading is also guaranteed.
In addition, SG6901A provides protection functions, such as brownout and RI pin open/short protection.
Ordering Information Part Number Operating Temperature Range SG6901ASZ -30°C to +85°C Eco Status RoHS Package 20-Lead, Small Outline Integrated Circuit (SOIC), JEDEC MS013, .
300 inch, Wide Body Packing Method Tape & Reel For Fairchild’s definition of “green” Eco...


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