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CS1501
2. PIN DESCRIPTION
Link V oltage S ens e
S tandby
Rec tifier V oltage S ens e
P FC Current S ens e
IFB
S TBY
IAC
CS
1
2
3
4
8
7
6
5
V DD
GD
GND
ZCD
IC S upply V oltage
P FC Gate Driv er
Ground
P FC Zero-c urrent Detec t
8-lead S OIC
Figure 2. CS1501 Pin Assignments
Pin Name
IFB
STBY
IAC
CS
Pin #
1
2
3
4
I/O
IN
IN
IN
IN
Description
Link Voltage Sense — A current proportional to the output link voltage of the PFC is
input here. The current is measured with an ADC.
Standby — A voltage below 0.8V puts the IC into a non-operating, low-power state.
The input has an internal 600k ? pull-up resistor to the V DD pin.
Rectifier Voltage Sense — A current proportional to the rectified line voltage is input
here. The current is measured with an ADC.
PFC Current Sense — The current flowing in the PFC MOSFET is sensed through a
resistor. The resulting voltage is applied to this pin and digitized for use by the PFC
computational logic to limit the maximum current through the power FET.
PFC Zero-current Detect — Boost Inductor demagnetization sensing input for
ZCD
5
IN
zero-current detection (ZCD) information. The pin is externally connected to the PFC
boost inductor auxiliary winding through an external resistor divider.
GND
GD
6
7
PWR
OUT
Ground — Common reference. Current return for both the input signal portion of the IC
and the gate driver.
PFC Gate Driver — The totem pole stage is able to drive the power MOSFET with a
peak current of 0.5A source and 1.0A sink.
IC Supply Voltage — Supply voltage of both the input signal portion of the IC and the
V DD
8
PWR
gate driver. A storage capacitor is connected on this pin to serve as a reservoir for oper-
ating current for the device, including the gate drive current to the power transistor. This
pin is clamped to a maximum voltage (V z ) by an internal zener function.
DS927F4
3
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