CS1615/16
2. PIN DESCRIPTION
No Connect
NC
IAC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
FBAUX
NC
Zero-current Detect
No Connect
Rectifier Voltage Sense
Voltage Clamp Current Source
Source Ground
CLAMP
SGND
SOURCE
NC
VDD
IC Supply Voltage
Gate Drive
GD
Source Switch
GND
Ground
No Connect
FBSENSE
eOTP
CTRL2
Flyback Current Sense
No Connect
NC
External Overtemperature Protection
LED Load Current
Dimmer Hold Current
CTRL1
16-lead SOIC and TSSOP
Figure 2. CS1615/16 Pin Assignments
Pin Name
NC
Pin #
I/O
Description
No Connect — Leave pin unconnected.
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
source-switched dimmer-compatibility circuit.
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 source-switched external high-volt-
age FET.
SOURCE
NC
NC
6
7
IN
IN
No Connect — Connect this pin to VDD using a 47k pull-up resistor.
No Connect — Connect this pin to VDD using a 47kpull-up resistor.
Dimmer Hold Current — Connect a resistor to this pin to set the minimum input cur-
rent being pulled by the flyback/buck-boost stage.
CTRL1
CTRL2
eOTP
8
9
IN
IN
IN
LED Load Current — Connect a resistor to this pin to set the LED current.
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
Feedback Current Sense — The current flowing in the power FET is sensed across a
resistor. The resulting voltage is applied to this pin and digitized for use by the compu-
tational 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
PWR
OUT
Gate Drive — Gate drive for the 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 tran-
sistor.
VDD
14
PWR
NC
15
16
-
No Connect — Leave pin unconnected.
Zero-current Detect — Connect to the flyback/buck-boost inductor auxiliary winding
for demagnetization current zero-crossing detection.
FBAUX
IN
DS961F1
3
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