Advance Product Information

This document contains information for a product under development.

Cirrus Logic reserves the right to modify this product without notice.

Copyright

 Cirrus Logic, Inc. 2010

(All Rights Reserved)

Cirrus Logic, Inc.

http://www.cirrus.com

CS1500

Digital Power Factor Correction IC

• Undervoltage Lockout (UVLO)

• Output Overvoltage Protection

• Input Current Limiting

• Output Overpower Protection

• Input Brownout Protection

• Open/short Loop Protection for IAC & FB Pins

• Thermal Shutdown

Description

The CS1500 is a high-performance power factor correction

(PFC) controller for universal AC input, which uses a proprie-

tary digital algorithm for discontinuous conduction mode

(DCM) with variable on-time and variable frequency control,

ensuring unity power factor, shaping EMI noise, achieving ex-

cellent efficiency especially at light load conditions.

The CS1500 incorporates all the safety features necessary for

robust and compact PFC stages. In addition, it has burst mode

control to lower the light load/standby losses to a minimum.

The digital controller optimizes the system stability and tran-

sient performance, simplifies the PFC design, reduces the

external component count and BOM costs. The simple design

and minimum cost makes CS1500 the ideal choice for PFC up

to 300 watts.

Pin Assignments

NC

STBY

IAC

FB

NC

VDD

GD

GND

1

2

3

4

8

7

6

5

8-lead SOIC

D2

C1

D1

CS1500

C2

C3

Q1

6

2

8

4

5

7

3

1

R1a

R1b

R2a

R2b

R3

FB

GD

NC

STBY

GND

VDD

IAC

NC

BR1

AC

Mains

Regulated

DC Output

MAY ‘10

DS849A5

May ?$shortyear>

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