?2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN4800AS/CS/01S/02S " Rev. 1.0.2
6
Pin Configuration
Figure 7.
Pin Configuration (Top View)
Pin Definitions
Pin # Name Description
1
IEA
Output of PFC Current Amplifier. The signal from this pin is compared with an internal
sawtooth to determine the pulse width for PFC gate drive.
2
IAC
Input AC Current. For normal operation, this input provides current reference for the multiplier.
The suggested maximum IAC is 100 礎.
3
ISENSE
PFC Current Sense. The non-inverting input of the PFC current amplifier and the output of
multiplier and PFC ILIMIT comparator.
4
VRMS Line-Voltage Detection. The pin is used for the PFC multiplier.
5
SS
PWM Soft-Start. During startup, the SS pin charges an external capacitor with a 10 ?/SPAN>A
constant current source. The voltage on FBPWM is clamped by SS during startup. If a
protection condition occurs and/or PWM is disabled, the SS pin is quickly discharged.
6
FBPWM PWM Feedback Input. The control input for voltage-loop feedback of PWM stage.
7
RT/CT Oscillator RC Timing Connection. Oscillator timing node; timing set by R
T
and C
T
.
8
RAMP
PWM RAMP Input. In current mode, this pin functions as the current-sense input; when in
voltage mode, it is the feedforward sense input from PFC output 380 V (feedforward ramp).
9
ILIMIT
Peak Current Limit Setting for PWM. The peak current limits setting for PWM.
10
GND
Ground.
11
OPWM
PWM Gate Drive. The totem-pole output drive for PWM MOSFET. This pin is internally
clamped under 19 V to protect the MOSFET.
12
OPFC
PFC Gate Drive. The totem-pole output drive for PFC MOSFET. This pin is internally clamped
under 15 V to protect the MOSFET.
13
VDD
Supply. The power supply pin. The threshold voltages for startup and turn-off are 11 V and
9.3 V, respectively. The operating current is lower than 10 mA.
14
VREF
Reference Voltage. Buffered output for the internal 7.5 V reference.
15
FBPFC
Voltage Feedback Input for PFC. The feedback input for PFC voltage loop. The inverting input
of PFC error amplifier. This pin is connected to the PFC output through a divider network.
16
VEA
Output of PFC Voltage Amplifier. The error amplifier output for PFC voltage feedback loop.
A compensation network is connected between this pin and ground.
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