CS1500 Datasheet, PDF (1/22 Pages) Cirrus Logic – Digital Power Factor Correction IC

May ?$shortyear>
CONFIDENTIAL
CS1500
Digital Power Factor Correction IC
Features & Description
 Digital EMI Noise Shaping
 Excellent Efficiency Under All Load Conditions
 Minimal External Devices Required
 Optimized Digital Loop Compensation
 Comprehensive Safety Features
• 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 1
8 NC
STBY 2
7 VDD
IAC 3
6 GD
FB 4
5 GND
8-lead SOIC
AC
Mains
R AC
R 1a
R 1b
BR 1
C1
C2
D1
LB
1
NC
8
NC
3
IA C
4
FB
7
VD D
2
ST B Y
5
GND
C S 1500
6 R3
GD
D2
R FB
R 2a
R 2b
Regulated
C3 _{DC Output}
Q1
Advance Product Information
This document contains information for a product under development.
Cirrus Logic reserves the right to modify this product without notice.
Cirrus Logic, Inc.
http://www.cirrus.com
Copyright  Cirrus Logic, Inc. 2010
(All Rights Reserved)
MAY ‘10
DS849A5