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Fairchild Semiconductor Electronic Components Datasheet

SG6961 Datasheet

Power Factor Controller

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SG6961 pdf
Power Factor Controller
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FEATURES
„ Boundary Mode PFC Controller
„ Low Input Current THD
„ Controlled On-Time PWM
„ Zero-Current Detection
„ Cycle-by-Cycle Current Limiting
„ Leading-Edge Blanking Instead of RC Filtering
„ Low Start-up Current (10µA Typical)
„ Low Operating Current (4.5mA Typical)
„ Feedback Open-Loop Protection
„ Programmable Maximum On-Time (MOT)
„ Output Over-Voltage Clamping Protection
„ Clamped Gate Output Voltage 16.5V
APPLICATIONS
„ Electric Lamp Ballasts
„ AC-DC Switching Mode Power Converter
„ Open-Frame Power Supplies and Power Adapters
„ Flyback Power Converters with ZCS/ZVS
Product Specification
SG6961
DESCRIPTION
The SG6961 is an 8-pin boundary mode PFC controller IC
intended for controlling PFC pre-regulators. The SG6961
provides a controlled on-time to regulate the output DC
voltage and achieve natural power factor correction. The
maximum on-time of the external switch is programmable
to ensure safe operation during AC brownouts. An
innovative multi-vector error amplifier is built in to
provide rapid transient response and precise output
voltage clamping. A built-in circuit disables the controller
if the output feedback loop is opened. The start-up current
is lower than 20µA and the operating current is under
4.5mA. The supply voltage can be up to 20V, maximizing
application flexibility.
TYPICAL APPLICATION
VAC
ZCD COMP INV
VCC
MOT
SG6961
GND
GD
CS
Vo
© System General Corp.
Version 1.3.1 (IRO33.0028.B6)
- 1 - www.sg.com.tw • www.fairchildsemi.com
September 24, 2007


Fairchild Semiconductor Electronic Components Datasheet

SG6961 Datasheet

Power Factor Controller

No Preview Available !

SG6961 pdf
Power Factor Controller
www.DataSheet4U.com
MARKING DIAGRAMS
Product Specification
SG6961
PIN CONFIGURATION
SG6961TP
XXXXXXXXYWWV
T: D=DIP, S=SOP
P : Z=Lead Free + ROHS
Compatible
Null=regular package
XXXXXXXX: Wafer Lot
Y: Year; WW: Week
V: Assembly Location
INV
COMP
MOT
CS
VCC
GD
GND
ZCD
ORDERING INFORMATION
Part Number
Pb-Free
SG6961SZ
SG6961DZ
Package
8-Pin SOP
8-Pin DIP
PIN DESCRIPTIONS
Pin No. Symbol Description
1
INV
Inverting input of the error amplifier. INV is connected to the converter output via a resistive divider. This pin
is also used for over-voltage clamping and open-loop feedback protection.
2
COMP
The output of the error amplifier. To create a precise clamping protection, a compensation network between
this pin and GND is suggested.
3
MOT
A resistor from MOT to GND is used to determine the maximum on-time of the external power MOSFET. The
maximum output power of the converter is a function of the maximum on-time.
4
CS
Input to the over-current protection comparator. When the sensed voltage across the sense resistor reaches
the internal threshold (0.82V), the switch is turned off to activate cycle-by-cycle current limiting.
Zero Current Detection. This pin is connected to an auxiliary winding via a resistor to detect the zero crossing
5
ZCD
of the switch current. When the zero crossing is detected, a new switching cycle is started. If it is connected
to GND, the device is disabled.
6
GND
The power ground and signal ground. Placing a 0.1µF decoupling capacitor between the VCC and GND pins
is recommended.
7 GD Totem-pole driver output to drive the external power MOSFET. The clamped gate output voltage is 16.5V.
8
VCC
Driver and control circuit supply voltage.
© System General Corp.
Version 1.3.1 (IRO33.0028.B6)
- 2 - www.sg.com.tw • www.fairchildsemi.com
September 24, 2007


Part Number SG6961
Description Power Factor Controller
Maker Fairchild Semiconductor
Total Page 14 Pages
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