SG6901 − PFC/Flyback-PWM Controller

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 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. 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.

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Product Status/Pricing/Packaging

Index	Product	Product & Eco Status	*Pricing	Packaging & Packing Info	**Package Marking Convention	Qualification Support	Compliance Certificates
0	SG6901ASZ	Last time buys being accepted until 14-Sep-2013 as of 16-Mar-2013 ROHS Compliant	$1.26	SO 20L WB Details SO 20L WB Drawing TAPE REEL	Line 1:SG6901ASZ Line 2:R1&6&3 (3-Digit Date Code) &Z (Plant Code)	ESD (HBM) : 4500 V R_ƟJC : 23.64 °C/W Moisture Sensitivity Level (MSL) : 3 Show more... Max Reflow Temp : 260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG

Fairchild 1,000 piece Budgetary Pricing. *
If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
Top mark packaging information for product SG6901 is available. **

Features

Interleaved PFC/PWM Switching
Low Startup 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 Protections
PFC and PWM Feedback Open-Loop Protection
Cycle-by-Cycle Current Limiting for PFC/PWM
Slope Compensation for PWM
H/L Line Over-Power Compensation for PWM
Brownout Protection
Over-Temperature Protection (OTP)
Over-temperature protection (OTP)

Applications

AC-DC Merchant Power Supply

Application Notes

Application Note	Description
AN-6902	Applying SG6902 to Control a CCM PFC and Flyback/PWM Power Supply(552 K) 05-Mar-2011

Additional Resources

Design Tools Knowledgebase – Ask a Question Find a local sales office Product change notices (PCN) How to Buy Products or Order Samples

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