CS1610/11/12/13

DS929F5

3

2. PIN DESCRIPTION

Pin Name

Pin #

I/O

Description

BSTAUX

1IN

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.

IAC

2IN

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.

CLAMP

3OUT

Voltage Clamp Current Source

— Connect to a voltage clamp circuit on the output

of the boost stage.

SGND

4PWR

Source Ground

— Common reference current return for the SOURCE pin.

SOURCE

5IN

Source Switch

— Connected to the source of the boost stage external high-voltage

FET.

NC

6IN

No Connect

— Connect this pin to VDD using a pull-up resistor.

NC

7IN

No Connect

— Connect this pin to VDD using a pull-up resistor.

IPK

8IN

Boost Peak Current

— Connect a resistor to this pin to set the peak current of the

boost circuit.

FBGAIN

9IN

Second Stage Gain

— Connect a resistor to this pin to set the switching frequency

gain for the second stage.

eOTP

10

IN

External Overtemperature Protection

— Connect an external NTC thermistor to

this pin, allowing the internal A/D converter to sample the change to NTC resistance.

FBSENSE

11

IN

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.

GND

12

PWR

Ground

— Common reference. Current return for both the input signal portion of the

IC and the gate driver.

GD

13

OUT

Gate Driver

— Gate drive for the second stage power FET.

VDD

14

PWR

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.

FBAUX

15

IN

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.

BSTOUT

16

IN

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.

No Connect

Source Switch

Source Ground

Boost Zero-current Detect

Rectifier Voltage Sense

Boost Peak Current

NC

NC

No Connect

SOURCE

SGND

BSTAUX

eOTP

External Overtemperature Protection

FBSENSE

Second Stage Current Sense

GND

Ground

GD

Gate Driver

VDD

IC Supply Voltage

FBAUX

Second Stage Zero-current Detect

BSTOUT

Boost Output Voltage Sense

IAC

CLAMP

Voltage Clamp Current Source

16-lead SOICN

IPK

FBGAIN

Second Stage Gain

7

6

5

4

3

2

1

10

11

12

13

14

15

16

8

9

Figure 2. CS1610/11/12/13 Pin Assignments