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
STBY
IAC
FB
1
2
3
4
8
7
6
5
NC
VDD
GD
GND
8-lead SOIC
D1
D2
L
B
R
AC
R1a
R1b
BR1
C1
8
4
2
6
R3
Q1
R
FB
R2a
R2b
1
3
7
NC
IAC
VDD
GND
NC
FB
STBY
GD
C3
AC
Mains
C2
Regulated
DC Output
5
CS1500
Advance Product Information
Cirrus Logic, Inc.
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)
MAY ‘10
DS849A5
CIRRUS [ CIRRUS LOGIC ]
