FAN6961 Datasheet, PDF (3/13 Pages) Fairchild Semiconductor – Boundary Mode PFC Controller

Marking Information
FAN6961
TPM
Pin Configuration
F- Fairchild Logo
Z- Plant Code
X- Year Code
Y- Week Code
TT: Die Run Code
T: Package type (S=SOP, D=DIP)
P: Z: Pb Free
Y: Green Compound
M: Manufacture Flow Code
Figure 3. Marking Information
VCC GATE GND ZCD
8
7
6
5
Figure 4.
1
2
3
4
INV COMP MOT CS
DIP and SOP Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Name
INV
COMP
MOT
CS
ZCD
GND
GATE
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.
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.
© 2008 Fairchild Semiconductor Corporation
FAN6961 • Rev. 1.0.2
3
www.fairchildsemi.com