LED Lighting Solutions
TRIAC Dimmable Driver ICs
Setting the Standard for Dimmer Compatibility
A19
The Flicker Effect
Leading the Market
Cirrus Logic has entered the emerging high-growth LED lighting market with a digital LED controller
that directly solves dimmer compatibility issues that have been a major barrier to consumer
adoption of LED retrofit bulbs. Featuring Cirrus Logic’s new digital TruDim™ technology, the CS161X
controller family has been tested to provide near 100 percent compatibility with a wide array of
dimmers representing the vast majority of the installed base worldwide.
LED retrofit bulbs are considered by many as the heir apparent to
incandescent and compact fluorescent lamps due to their superior energy
efficiency and long life. Key barriers to mass adoption have been higher cost
and, like compact fluorescents, poor dimmer compatibility. None of the LED
bulbs available today, which are primarily based on analog controllers, provide
consumers broad compatibility with the wide variety of dimmers installed within
residences, retailers and businesses. Dimmer incompatibly problems, which
include bulbs that produce flickering or flashing light, or the inability to turn on or
off, are a leading cause for high rate of return by consumers.
Leading market research firms project that the LED lamp market in ambient lighting
applications will grow from around 200 million units in 2011 to around one billion units
by 2015. Thus, solving the issue of universal compatibility with dimmer systems on a
global scale is one of the biggest challenges facing the lighting industry.
The Universal Solution:
Digital TruDim™ Technology
The CS161X family enables industry-leading dimmer compatibility as a result
of a three-year investment in TRIAC interface algorithms, LED driver topologies
and system architecture, which are the foundation of TruDim technology. The
CS161X’s digital intelligence allows the controller to identify the type of dimmer
in use and adapt the algorithm to provide smooth dimming in much the same
way the consumer has come to expect from decades of using incandescent
light bulbs. This smart adaptive digital signal processing technology is not
possible with today’s analog controllers.
Copyright © 2012 Cirrus Logic, Inc. All rights reserved. Printed in the USA.
Cirrus Logic, Inc. and its subsidiaries (“Cirrus”) believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is
provided 'as is' without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied
upon is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification,
and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, or for infringement of patents or other rights of third parties. This document is the property of Cirrus
and, by furnishing this information, Cirrus grants no license, express or implied, under any patents, mask work rights, copyrights, trademarks, trade secrets, or other intellectual property rights. No
part of this publication may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or otherwise) unless distributed
in its entirety with all copyright notices attached. No part of this publication may be used as a basis for manufacture or sale of any items without the prior written consent of Cirrus.
TM
Certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage (“critical applications”). Cirrus products are not
designed, authorized, or warranted to be suitable for use in products surgically implanted into the body, automotive safety or security devices, life-support products or other critical applications.
Inclusion of Cirrus products in such applications is understood to be fully at the customer’s risk and Cirrus disclaims and makes no warranty of merchantability and fitness for particular purpose,
with regard to any Cirrus product that is used in such a manner. If the customer uses or permits the use of Cirrus products in critical applications, customer agrees, by such use, to fully indemnify
Cirrus, its officers, directors, employees, distributors and other agents from any and all liability, including attorneys’ fees and costs, that may result from or arise in connection with these uses.
Cirrus Logic, Cirrus, the Cirrus Logic logo designs, EXL Core, the EXL Core logo design, TruDim, and the TruDim logo design are trademarks of Cirrus Logic, Inc.
All other brand and product names in this document may be trademarks or service marks of their respective owners.
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LED Lighting Solutions
1
CS161X Family of TRIAC
Dimmable Driver ICs
The CS161X is the first family of products in Cirrus Logic’s new line of LED controller solutions
designed to help leading LED lamp manufacturers solve complex engineering challenges and drive
high-volume LED sales growth. The CS161X family’s unique adaptive dimmer compatibility algorithm
controls the boost stage to enable best-in-class flicker-free phase dimming across the light spectrum,
including “deep dimming” down to zero percent of light output with leading edge, trailing edge and digital dimmers.
The CS161X family integrates a variable conduction mode boost converter (CRM/CCM), providing power factor correction
and dimmer compatibility with primary-side control, constant output current and quasi-resonant flyback or buck output
stage, and includes solutions for both 100-120 VAC and 220-240 VAC line voltages.
Cirrus Logic’s family of TRIAC dimmable LED drivers set a new standard for lighting through the combination of three
critical features:
The highest TRIAC dimmer compatibility in the industry
High efficiency
Flicker-free dimming
CS161X
The CS1610/11/12/13 digital control ICs are engineered to deliver a high-efficiency, cost effective, flicker-free, phase-dimmable,
solid state lighting (SSL) solution for the incandescent lamp replacement market. The CS1610/11 is designed to control a
quasi-resonant flyback topology while the CS1612/13 is designed to control a buck topology.
The CS1610/11/12/13 integrate a critical conduction mode (CRM) boost converter that provides power factor correction and
dimmer compatibility with a constant output current, quasi-resonant second stage. An adaptive dimmer compatibility
algorithm controls the boost stage and dimmer compatibility operation mode to enable flicker-free operation to 0% output
current with leading-edge, trailing-edge and digital dimmers (dimmers with an integrated power supply).
Features:
Best-in-class dimmer compatibility
Leading-edge (TRIAC) dimmers
Trailing-edge dimmers
Digital dimmers (with integrated power supply)
Up to 90% efficiency
Flicker-free dimming
0% minimum dimming level
Temperature compensated LED current
Quasi-resonant second stage with constant
current output
Flyback and buck
Fast startup
Tight LED current regulation: better than ±5%
Primary side regulation (PSR)
>0.9 power factor
IEC 61000-3-2 compliant
NEMA C82.77 compliant
ENERGY STAR™ compliant
Soft start
Protections
Output open/short
Current sense resistor open/short
External over temperature using NTC
TRIAC Dimmer Compatibility
AC Mains
The CS1610/11/12/13 driver ICs offer up to 90% efficiency and
the highest TRIAC dimmer compatibility in the industry.
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LED Lighting Solutions
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Cirrus Logic’s EXL Core is a unique digital approach to developing green energy
products. It represents more than 80 patents in signal processing innovation via
complex algorithms along with analog peripherals.
Product Selector Table
Typical Flyback Schematic
Part
TRIAC
Dimmable
Output
Stage
Topology
Input
Voltage
Range
Maximum
Output
Power
LED
Output
Channels
Power
Factor
Output
Current
Reg.
Min.
Dimming
Level
External
Over Temp
Protect
Package
CS1610
Flyback;
Buck-boost
100 - 120 VAC
< 25 W
1
> 0.9
< 5%
0%
16eSOIC
CS1611
Flyback;
Buck-boost
220 - 240 VAC
< 25 W
1
> 0.9
< 5%
0%
16eSOIC
CS1612
Buck;
Tapped-buck
100 - 120 VAC
< 25 W
1
> 0.9
< 5%
0%
16eSOIC
CS1613
Buck and
Tapped-buck
220 - 240 VAC
< 25 W
1
> 0.9
< 5%
0%
16eSOIC
Output Stage Topology
Typical Buck Schematic
Input
Voltage
Range
Flyback
Buck-boost
Buck
Tapped-buck
100 - 120 VAC
CS1610
CS1612
220 - 240 VAC
CS1611
CS1613
Reference Designs
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Part
Nominal
Input
Voltage
Rated
Input
Power
Output
Stage
Topology
Output
Voltage
Output
Current
Efficiency
CRD 1611 – 8W
230 VAC
8.0 W
Flyback
11.0 V - 12. 6 V
550 mA
83%
CRD 1610 – 8W
120 VAC
8.1 W
Flyback
14.0 V - 15.8 V
470 mA
84%
LED Lighting Solutions
5
12
1.00
10
0.80
Output Current (A)
Input Power (W)
8
6
4
0.60
0.40
0.20
2
0
20
40
60
80
100
120
140
160
0.00
180
200
210
220
Dim Angle (°)
230
240
250
260
Line Voltage (V)
0.6
90
0.5
80
Output Current (A)
Cirrus Logic acquired more than 200 dimmers from all over
the world and developed a compatibility test to measure the
performance of existing solutions against the CS161X products.
Tests were performed on 120 V and 230 V products, in single and
multi-lamp configurations of five and ten lamps in parallel, and a
final test score was derived based upon five key parameters: (1)
functionality (2) flicker-free steady state (3) flicker-free transient
(4) smooth dimming, and (5) dimming range (max-minimum).
Cirrus Logic’s CS161X family performed near flawlessly across
the test’s metrics, achieving 99� compatibility. The closest
competitive LED controller performed at 73�, and the average
among today’s current LED controllers was 50�.
CRD1611 - 8W Typical Performance
Efficiency (%)
Proven Performance:
Near 100 Percent Tested
Dimmer Compatibility
70
0.4
0.3
0.2
60
0.1
Dimmer Compatibility Comparison
100
50
200
210
220
98
230
240
250
260
0
20
40
60
80
100
120
140
160
180
200
Dim Angle (°)
Vin (VAC)
1.00
60
58
57
0.90
52
40
47
Power Factor
Compatibility Percentage ( %)
80
0.80
0.70
20
0.60
200
210
220
230
240
250
260
Vin (VAC)
0
Cirrus Logic
Company A
Company B
Company C
Company D
Comparison based on 230 VAC input LED retrofit lamps
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LED Lighting Solutions
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Reference
Designs
CRD1611-8W
The CRD 1611-8W reference design demonstrates
the performance of the CS1611 resonant mode AC/
DC dimmable LED driver IC with a 550 mA output
driving 4 LEDs in series. It offers best-in-class dimmer
compatibility with leading edge, trailing edge, and digital
dimmers. The form factor is targeted to fit into many LED
bulb applications (A19, PAR).
Dimensions:
Length x Width x Height = 58.0 mm x 30.0 mm x 18.0 mm
CRD1610-8W
The CRD 1610-8W reference design demonstrates the
performance of the CS1610 resonant mode AC/DC
dimmable LED driver IC with a 470 mA output driving
5 X LEDs in series. It offers best-in-class dimmer
compatibility with leading edge, trailing edge and digital
dimmers. The form factor is targeted to fit into many LED
bulb applications (A19, PAR).
Features:
Quasi-resonant flyback with constant
current output
Flicker-free dimming
Line voltage 230 VAC, ±10%
Rated input power: 8 W
Rated output power: 6.6 W
Efficiency: 83% at 550 mA, for 4 X LEDs in series
Low component count
Supports Cirrus Logic product CS1611
Dimensions:
Length x Width x Height = 58.0 mm x 30.0 mm x 18.0 mm
Features:
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Quasi-resonant flyback with constant current output
Flicker-free dimming
Line voltage 120 VAC, ±10%
Rated input power: 8.1 W
Rated output power: 6.7 W
Efficiency: 84% at 470 mA, for 5 X LEDs in series
Low component count
Supports Cirrus Logic product CS1610
LED Lighting Solutions
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Cirrus Logic, Inc.
2901 Via Fortuna
Austin, Texas 78746
T +1 512-851-4000
F +1 512-851-4977
Toll-Free +1 800-888-5016
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