http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




Fairchild Semiconductor Electronic Components Datasheet

SG6905 Datasheet

Green mode PFC/Flyback-PWM Controller

No Preview Available !

SG6905 pdf
October 2008
SG6905
Green Mode PFC/Flyback-PWM Controller
Features
ƒ Interleaved PFC/PWM Switching
ƒ Green Mode PWM Operation
ƒ Low Startup and Operating Current
ƒ Innovative Switching-Charge Multiplier-Divider
ƒ Average-Current-Mode Control for PFC
ƒ PFC Over-Voltage and Under-Voltage Protections
ƒ PFC Remote On/Off Control
ƒ PFC and PWM Feedback Open-Loop Protection
ƒ Cycle-by-Cycle Current Limiting for PFC/PWM
ƒ Slope Compensation for PWM
ƒ Constant Power Limit for PWM
ƒ Power-On Sequence Control
ƒ Brownout Protection
ƒ Over-Temperature Protection
Applications
ƒ Switching Power Suppliers with Active PFC
ƒ High-Power Adaptors
ƒ LCD TV Applications
Description
The highly integrated SG6905 is specially designed for
power supplies consisting of boost PFC and flyback
PWM. It requires very few external components to
achieve green-mode operation and versatile
protections. It is available in 20-pin SOP package.
The proprietary interleave-switching feature
synchronizes the PFC and PWM stages and reduces
switching noise. At light loads, 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, the SG6905 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.
During startup, the RDY (ready) is pulled low until the
PFC output voltage reaches the setting level. This
signal can be used to control the second power stage
for proper power-on sequence.
In addition, SG6905 provides complete protection
functions, such as brownout protection and RI pin
open/short.
Ordering Information
Part Number
SG6905SY
Operating
Temperature Range
Package
-40°C to +105°C 20-pin Small Outline Package (SOP)
Eco Status
Green
Packing
Method
Tape & Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2007 Fairchild Semiconductor Corporation
SG6905 • Rev. 1.1.2
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

SG6905 Datasheet

Green mode PFC/Flyback-PWM Controller

No Preview Available !

SG6905 pdf
Application Diagram
Figure 1. Typical Application
© 2007 Fairchild Semiconductor Corporation
SG6905 • Rev. 1.1.2
2
www.fairchildsemi.com


Part Number SG6905
Description Green mode PFC/Flyback-PWM Controller
Maker Fairchild Semiconductor
Total Page 20 Pages
PDF Download
SG6905 pdf
Download PDF File
SG6905 pdf
View for Mobile



Buy Electronic Components




Related Datasheet

1 SG6901A PFC / Flyback PWM Controller Fairchild Semiconductor
Fairchild Semiconductor
SG6901A pdf
2 SG6902 Green-Mode PFC / Flyback-PWM Controller Fairchild Semiconductor
Fairchild Semiconductor
SG6902 pdf
3 SG6905 Green mode PFC/Flyback-PWM Controller Fairchild Semiconductor
Fairchild Semiconductor
SG6905 pdf
4 SG6905 Green mode PFC/Flyback-PWM Controller System General
System General
SG6905 pdf
5 SG6905SY Green mode PFC/Flyback-PWM Controller Fairchild Semiconductor
Fairchild Semiconductor
SG6905SY pdf






Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components