CS1630/31
2. PIN DESCRIPTION
Boost Output Voltage Sense
16
15
14
13
12
11
10
9
BSTOUT
FBAUX
VDD
Boost Zero-current Detect
Rectifier Voltage Sense
Voltage Clamp Current Source
Source Ground
BSTAUX
IAC
1
2
3
4
5
6
7
8
Second Stage Zero-current Detect
IC Supply Voltage
CLAMP
SGND
SOURCE
SDA
GD
Gate Driver
Source Switch
Ground
GND
I2C Data
I2C Clock
FBSENSE
eOTP
SYNC
Second Stage Current Sense
SCL
External Overtemperature Protection
Second Stage Synchronization
No Connection
NC
16-lead SOIC
Figure 2. CS1630/31 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
I2C™ Data — I2C data.
SDA
SCL
NC
6
7
8
I/O
IN
-
I2C™ Clock — I2C clock.
No Connection — Leave pin unconnected.
Second Stage Synchronization — A digital synchronization signal that indicates
which channel the controller is signaling for each gate switching period.
External Overtemperature Protection — Connect an external NTC thermistor to
this pin, allowing the internal A/D converter to sample the change to NTC resistance.
SYNC
eOTP
9
OUT
IN
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.
Ground — Common reference. Current return for both the input signal portion of the
IC and the gate driver.
FBSENSE
11
IN
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
operating current for the device, including the gate drive current to the power transistor.
VDD
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.
FBAUX
15
16
IN
IN
BSTOUT
DS954F2
5
APEX [ CIRRUS LOGIC ]
