SG6961 Fairchild Semiconductor, SG6961 Datasheet - Page 2

• Manufacturer Part Number: SG6961
• Description: Power Factor Controller
• Manufacturer: Fairchild Semiconductor

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Power Factor Controller
MARKING DIAGRAMS
ORDERING INFORMATION
Part Number
SG6961SZ
SG6961DZ
PIN DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
© System General Corp.
Version 1.3.1 (IRO33.0028.B6)
XXXXXXXXYWWV
SG6961TP
Symbol
INV
COMP
MOT
CS
ZCD
GND
GD
VCC
Description
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.
The output of the error amplifier. To create a precise clamping protection, a compensation network between
this pin and GND is suggested.
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.
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
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.
The power ground and signal ground. Placing a 0.1µF decoupling capacitor between the VCC and GND pins
is recommended.
Totem-pole driver output to drive the external power MOSFET. The clamped gate output voltage is 16.5V.
Driver and control circuit supply voltage.
Pb-Free
T: D=DIP, S=SOP
P :
XXXXXXXX: Wafer Lot
Y: Year; WW: Week
V: Assembly Location
Compatible
Null=regular package
Z=Lead Free + ROHS
Package
8-Pin SOP
8-Pin DIP
- 2 -
PIN CONFIGURATION
COMP
INV
MOT
CS
www.sg.com.tw • www.fairchildsemi.com
Product Specification
September 24, 2007
VCC
GD
GND
ZCD
SG6961