CS1610/11/12/13
2. PIN DESCRIPTION
Boost Zero-current Detect
Rectifier Voltage Sense
Voltage Clamp Current Source
Source Ground
Source Switch
No Connect
No Connect
Boost Peak Current
BSTAUX
IAC
CLAMP
SGND
SOURCE
NC
NC
IPK
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
BSTOUT
FBAUX
VDD
GD
GND
FBSENSE
eOTP
FBGAIN
Boost Output Voltage Sense
Second Stage Zero-current Detect
IC Supply Voltage
Gate Driver
Ground
Second Stage Current Sense
External Overtemperature Protection
Second Stage Gain
16-lead SOICN
Figure 2. CS1610/11/12/13 Pin Assignments
Pin Name
BSTAUX
Pin #
I/O
Description
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.
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.
Voltage Clamp Current Source
— Connect to a voltage clamp circuit on the output
of the boost stage.
Source Ground
— Common reference current return for the SOURCE pin.
Source Switch
— Connected to the source of the boost stage external high-voltage
FET.
No Connect
— Connect this pin to VDD using a pull-up resistor.
No Connect
— Connect this pin to VDD using a pull-up resistor.
Boost Peak Current
— Connect a resistor to this pin to set the peak current of the
boost circuit.
Second Stage Gain
— Connect a resistor to this pin to set the switching frequency
gain for the second stage.
External Overtemperature Protection
— Connect an external NTC thermistor to
this pin, allowing the internal A/D converter to sample the change to NTC resistance.
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.
Ground
— Common reference. Current return for both the input signal portion of the
IC and the gate driver.
Gate Driver
— Gate drive for the second stage power FET.
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.
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.
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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
IN
IN
OUT
PWR
IN
IN
IN
IN
IN
IN
IN
PWR
OUT
PWR
IN
IN
IAC
CLAMP
SGND
SOURCE
NC
NC
IPK
FBGAIN
eOTP
FBSENSE
GND
GD
VDD
FBAUX
BSTOUT
DS929F5
3
APEX [ CIRRUS LOGIC ]
