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May 2008
?2007 Fairchild Semiconductor Corporation
 
www.fairchildsemi.com
SG6932 " Rev. 1.1.3
SG6932
PFC / Forward PWM Controller
 
Features
    Interleaved PFC/PWM Switching  
    Low Operating Current 
    Innovative Switching-Charge Multiplier-divider 
    Multi-vector Control for Improved PFC Output 
Transient Response
    Average Current Mode for Input-current Shaping 
    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 
    Selectable PWM Maximum Duty Cycle: 50%, 65% 
    Brownout Protection 
    Power-on Sequence Control and Soft-start 
Applications
    Switch-mode Power Supplies with Active PFC 
    Servo-system Power Supplies 
    PC-ATX Power Supplies 
Description
The highly integrated SG6932 is designed for power
supplies with boost PFC and forward PWM. It requires
very few external components to achieve versatile
protections and compensation. It is available in 16-pin
DIP and SOP packages.
The
proprietary
interleave-switching
feature
synchronizes the PFC and PWM stages and reduces
switching noise. At light load, the switching frequency is
continuously decreased to reduce power consumption.
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, SG6932 shuts off to prevent
extra-high voltage on output.
For the forward PWM stage, the synchronized slope
compensation ensures the stability of the current loop
under continuous-conduction-mode (CCM) operation.
Hiccup    operation    during    output    overloading    is
guaranteed. The soft-start and programmable maximum
duty cycle ensure safe operation.
SG6932 provides complete protection functions, such
as brownout protection and RI open/short latch off.
 
 
 
 
 
 
Ordering Information
Part
Number
Operating Temperature
Range
Package
 Eco Status 
Packing
Method
SG6932DZ
-40癈 to +85癈
16-pin Dual In-Line Package (DIP)
RoHS
Tube
SG6932SZ
-40癈 to +85癈
16-pin Small Outline Package (SOP)
RoHS
Tape & Reel
 For Fairchilds definition of green Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html
.
 
 
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