CS1610 Datasheet, PDF (3/17 Pages) Cirrus Logic – TRIAC Dimmable LED Driver IC

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 1
IAC 2
CLAMP 3
SGND 4
SOURCE 5
NC 6
NC 7
IPK 8
16 BSTOUT
15 FBAUX
14 VDD
13 GD
12 GND
11 FBSENSE
10 eOTP
9 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 Pin #
I/O
BSTAUX
1
IN
IAC
2
CLAMP
3
SGND
4
SOURCE
5
NC
6
NC
7
IPK
8
FBGAIN
9
eOTP
10
IN
OUT
PWR
IN
IN
IN
IN
IN
IN
FBSENSE
11
IN
GND
GD
VDD
12
PWR
13
OUT
14
PWR
FBAUX
15
IN
BSTOUT
16
IN
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.
DS929F5
3