CS1601
CS1601H
Digital PFC Controller for Electronic Ballasts
Features
& Description
Low PFC System Cost
Best-in-class THD
Digital EMI Noise Shaping Reduces Conducted EMI
Adaptive Switching Frequency Control Minimizes Boost
Inductor Size
Overview
The CS1601 and CS1601H are digital power factor correction
(PFC) controllers designed to deliver the lowest PFC system
cost in electronic ballast applications. The controller operates
in a variable frequency discontinuous conduction mode (VF-
DCM) with zero-current switching (ZCS) optimized to deliver
best-in-class THD and minimize the size and cost of magnetic
components. The CS1601 operates at switching frequencies
up to 70 kHz while the CS1601H operates at frequencies
extending to 100kHz.
The VF-DCM control algorithm varies both duty cycle and
frequency. This spreads the EMI frequency spectrum, thus
reducing conducted EMI filtering requirements. In addition, the
maximum switching frequency is reached at the peak of the AC
input, which allows for use of a smaller, more cost-effective
boost inductor.
Th e fee dback loop is closed through an integrated
compensation network within the controller, eliminating the
need for additional external components. Protection features
such as overvoltage, overcurrent, open and short-circuit
protection, overtemperature, and brownout protect the system
during abnormal transient conditions.
High Efficiency Due to Zero-current Switching
Integrated Feedback Compensation Simplifies System
Design
Comprehensive Safety Features
• Undervoltage Lockout (UVLO)
• Output Overvoltage Protection
• Cycle-by-cycle Current Limiting
• Input Voltage Brownout Protection
• Open/Short Loop Protection for IAC & IFB Pins
• Thermal Shutdown
Pin placement similar to traditional boundary mode (CRM)
Controllers
Applications
& Description
LED Power Supply/Driver
Fluorescent Ballasts
HID Ballasts
V
rec t
L
B
Ordering Information
See
D1
V
link
BR1
BR1
R1
R2
R3
5
3
ZCD
IAC
V
DD
R5
R6
AC
Mains
8
VDD
1
IFB
GD
CS
C1
CS1601
CS1601H
GND
7
4
Q1
C2
Regulated
DC Output
BR 1
BR 1
STBY
R4
2
6
R7
Preliminary Product Information
Cirrus Logic, Inc.
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
Copyright
Cirrus Logic, Inc. 2011
(All Rights Reserved)
JUN ’11
DS931PP6
CIRRUS [ CIRRUS LOGIC ]
