CS1501 Datasheet, PDF (3/16 Pages) Cirrus Logic – Digital Power Factor Correction Control IC

2. PIN DESCRIPTION
CS1501
Link V oltage S ens e
S tandby
Rec tifier V oltage S ens e
P FC Current S ens e
IFB
S TBY
IA C
CS
1
8
2
7
3
6
4
5
8-lead S OIC
VDD
GD
GND
ZC D
IC S upply V oltage
P FC Gate Driv er
Ground
P FC Zero-c urrent Detec t
Figure 2. CS1501 Pin Assignments
Pin Name
IFB
Pin #
1
STBY
2
IAC
3
CS
4
ZCD
5
GND
6
GD
7
V_DD
8
I/O
IN
IN
IN
IN
IN
PWR
OUT
PWR
Description
Link Voltage Sense — A current proportional to the output link voltage of the PFC is
input into this pin. 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
into this pin. 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.
Zero-current Detect — Boost Inductor demagnetization sensing input for zero-current
detection (ZCD) information. The pin is externally connected to the PFC boost inductor
auxiliary winding through an external resistor divider.
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
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.
DS927PP6
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