Cirrus Logic CS1613A - Manual (Page 3)

CS1610A/11A
CS1612A/13A
DS976F1 3
2. PIN DESCRIPTION
Pin Name Pin # I/O Description
BSTAUX 1 IN
Boost Zero-current Detect — Boost Inductor demagnetization sensing input for
zero-current detection (ZCD) information. The pin is connected to the PFC boost
inductor auxiliary winding through an external resistor divider.
IAC 2 IN
Rectifier Voltage Sense — A current proportional to the rectified line voltage is fed
into this pin. The current is measured with an A/D converter.
CLAMP
3 OUT Voltage Clamp Current Source — Connect to a voltage clamp circuit on the output
of the boost stage.
SGND
4 PWR
Source Ground — Common reference current return for the SOURCE pin.
SOURCE 5 IN
Source Switch — Connected to the source of the boost stage external high-voltage
FET.
NC
6 IN
No Connect — Connect this pin to VDD using a pull-up resistor.
NC
7 IN
No Connect — Connect this pin to VDD using a pull-up resistor.
IPK
8 IN Boost Peak Current — Connect a resistor to this pin to set the peak current of the
boost circuit.
FBGAIN
9 IN Second Stage Gain — Connect a resistor to this pin to set the switching frequency
gain for the second stage.
eOTP
10 IN
External Overtemperature Protection — Connect an external NTC thermistor to
this pin, allowing the internal A/D converter to sample the change to NTC resistance.
FBSENSE
11 IN
Second Stage Current Sense — The current flowing in the second stage FET is
sensed across a resistor. The resulting voltage is applied to this pin and digitized for
use by the second stage computational logic to determine the FET's duty cycle.
GND
12 PWR
Ground — Common reference. Current return for both the input signal portion of the
IC and the gate driver.
GD
13 OUT
Gate Driver — Gate drive for the second stage power FET.
VDD
14 PWR
IC Supply Voltage — Connect a storage capacitor to this pin to serve as a reservoir for
operating current for the device, including the gate drive current to the power transistor.
FBAUX
15 IN
Second Stage Zero-current Detect — Second stage inductor sensing input. The
pin is connected to the second stage inductor’s auxiliary winding through an external
resistor divider.
BSTOUT
16 IN
Boost Output Voltage Sense — A current proportional to the boost output is fed
into this pin. The current is measured with an A/D converter.
No Connect
Source Switch
Source Ground
Boost Zero-current Detect
Rectifier Voltage Sense
Boost Peak Current
NC
NC No Connect
SOURCE
SGND
BSTAUX
eOTP External Overtemperature Protection
FBSENSE Second Stage Current Sense
GND Ground
GD Gate Driver
VDD IC Supply Voltage
FBAUX Second Stage Zero-current Detect
BSTOUT Boost Output Voltage Sense
IAC
CLAMP Voltage Clamp Current Source
16-lead SOICN
IPK FBGAIN Second Stage Gain
7
6
5
4
3
2
1
10
11
12
13
14
15
16
8 9
Figure 2. CS1610A/11A/12A/13A Pin Assignments