CS1610A/11A
CS1612A/13A
2. PIN DESCRIPTION
Boost Output Voltage Sense
Boost Zero-current Detect
BSTAUX
IAC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
BSTOUT
FBAUX
VDD
Second Stage Zero-current Detect
IC Supply Voltage
Rectifier Voltage Sense
Voltage Clamp Current Source
Source Ground
CLAMP
SGND
SOURCE
NC
GD
Gate Driver
Source Switch
GND
Ground
No Connect
FBSENSE
Second Stage Current Sense
No Connect
NC
eOTP
FBGAIN
External Overtemperature Protection
Second Stage Gain
Boost Peak Current
IPK
16-lead SOICN
Figure 2. CS1610A/11A/12A/13A Pin Assignments
Pin #
I/O
Pin Name
BSTAUX
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.
1
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.
IAC
2
IN
Voltage Clamp Current Source — Connect to a voltage clamp circuit on the output
of the boost stage.
CLAMP
SGND
3
4
5
OUT
PWR
IN
Source Ground — Common reference current return for the SOURCE pin.
Source Switch — Connected to the source of the boost stage external high-voltage
FET.
SOURCE
NC
NC
6
7
IN
IN
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.
IPK
8
9
IN
IN
IN
Second Stage Gain — Connect a resistor to this pin to set the switching frequency
gain for the second stage.
FBGAIN
eOTP
External Overtemperature Protection — Connect an external NTC thermistor to
this pin, allowing the internal A/D converter to sample the change to NTC resistance.
10
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.
FBSENSE
11
IN
Ground — Common reference. Current return for both the input signal portion of the
IC and the gate driver.
GND
GD
12
13
14
PWR
OUT
PWR
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
VDD
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
FBAUX
15
16
IN
IN
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.
BSTOUT
DS976PP4
3
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