CS1500_1 Datasheet, PDF (1/22 Pages) Cirrus Logic – Digital Power Factor Correction IC

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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 proprietary digital
algorithm for discontinuous conduction mode (DCM) with variable
on-time and variable frequency control, ensuring unity power factor.
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.
Protection features such as overvoltage, overcurrent, overpower,
open- and short-circuit protection, overtemperature, and brownout
help protect the device during abnormal transient conditions.
The digital controller optimizes the system stability and transient
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
R1a
R1 b
BR 1
C1
VDD
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)
JUL ‘10
DS849A7