CS1600

2

DS904A5

1. PIN DESCRIPTIONS

Table 1. Pin Descriptions

Pin Name

Pin #

I/O

Description

NC

1, 8

-

arise from leaving them unterminated.

STBY

2IN

Standby — This is an active-low pin. Shorting this pin to GND disables PFC switch-

ing. The input has a pull-up resistor and should be driven with an open-collector

device. Leave this pin unterminated when not in use.

IAC

3IN

Rectified Line Voltage Sense — The IAC pin is used to sense the rectified line volt-

age. This signal, in conjunction with the signal on the FB pin, is used in the Power

Factor Correction (PFC) algorithm

A filter capacitor of up to 2.2 nF may be added between this pin and VDD to provide

noise immunity.

FB

4IN

Feedback Voltage Sense — The FB pin is used to sense the output voltage of the

PFC stage. This signal, in conjunction with the signal on the IAC pin, is used in the

Power Factor Correction (PFC) algorithm.

A filter capacitor of up to 2.2 nF may be added between this pin and VDD to provide

noise immunity.

GND

5–

Ground — GND is a common reference for all the functional blocks in this device.

GD

6OUT

Gate Drive — GD is the output of the device with a source capability of 0.5 A and a

current sink capacity of 1 A.

VDD

7IN

has an internal shunt to ground. An external bias needs to be applied for steady-

state operation. A low-ESR ceramic decoupling capacitor at this pin is recommended

for reliable operation of this device.

NC

STBY

IAC

FB

NC

VDD

GD

GND

1

2

3

4

8

7

6

5