SG6961SY Fairchild Semiconductor, SG6961SY Datasheet - Page 4

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SG6961SY

Manufacturer Part Number
SG6961SY
Description
IC PFC CTRLR AVERAGE CURR 8SOIC
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of SG6961SY

Mode
Average Current
Frequency - Switching
50kHz
Current - Startup
10µA
Voltage - Supply
12 V ~ 20 V
Operating Temperature
-20°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2008 Fairchild Semiconductor Corporation
SG6961 • Rev. 1.3.2
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name
COMP
MOT
GND
VCC
ZCD
INV
GD
CS
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.
Maximum On Time. 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.
Current Sense. Input to the over-current protection comparator. When the sensed voltage
across the sense resistor reaches the internal threshold (0.8V), 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.
Ground. The power ground and signal ground. Placing a 0.1µF decoupling capacitor between
VCC and GND is recommended.
Driver Output. Totem-pole driver output to drive the external power MOSFET. The clamped
gate output voltage is 16.5V.
Power Supply. Driver and control circuit supply voltage.
Figure 4. Pin Configuration
4
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