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Power Factor Controller
MARKING DIAGRAMS
SG6961TP
XXXXXXXXYWWV
ORDERING INFORMATION
Part Number
Pb-Free
SG6961SZ
SG6961DZ
PIN DESCRIPTIONS
Pin No.
Symbol
Description
Inverting input of the error amplifier. INV is connected to the converter output via a resistive divider. This pin
1
INV
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
2
COMP
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
3
MOT
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
4
CS
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.
The power ground and signal ground. Placing a 0.1µF decoupling capacitor between the VCC and GND pins
6
GND
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)
T: D=DIP, S=SOP
P :
Z=Lead Free + ROHS
Compatible
Null=regular package
XXXXXXXX: Wafer Lot
Y: Year; WW: Week
V: Assembly Location
Package
8-Pin SOP
8-Pin DIP
23
Product Specification
PIN CONFIGURATION
INV
COMP
MOT
CS
www.sg.com.tw • www.fairchildsemi.com
SG6961
VCC
GD
GND
ZCD
September 24, 2007
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