• Quasi-resonant Flyback with Constant-current Output
• Flicker-free Dimming
• Line Voltage 207VAC - 253VAC
• Rated Output Power: 7W
• Efficiency: 82.5% at
• Supports Cirrus Logic CS1616
250mA
for 10LEDs in Series
General Description
The CRD1616-8W reference design demonstrates the
performance of the CS1616 single stage dimmable AC/ DC
LED driver IC with a 250mA output driving
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
(GU10, A19, PAR, BR).
DIMENSIONS (OVERALL)
Length Width Height
For more information, see Figure 3 on page 6.
ORDERING INFORMATION
CRD1616-8W-Z8 Watt Reference Design
Supports CS1616
10LEDs in
Cirrus Logic, Inc.
http://www.cirrus.com
Bottom
Copyright Cirrus Logic, Inc. 2013
(All Rights Reserved)
DEC‘13
DS1003RD4
CRD1616-8W
Contacting Cirrus Logic Support
For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find the one nearest to you
go to www.cirrus.com
IMPORTANT NOTICE
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 on 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, including use of this information as the basis for manufacture or sale of any items, 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. Cirrus owns the copyrights associated with the information contained herein and gives
consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
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 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, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER
OR CUSTOMER'S 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, and the EXL Core 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.
IMPORTANT SAFETY INSTRUCTIONS
Read and follow all safety instructions prior to using this demonstration board.
This Engineering Evaluation Unit or Demonstration Board must only be used for assessing IC performance in a
laboratory setting. This product is not intended for any other use or incorporation into products for sale.
This product must only be used by qualified technicians or professionals who are trained in the safety procedures
associated with the use of demonstration boards.
Risk of Electric Shock
•The direct connection to the AC power line and the open and unprotected boards present a serious risk of electric
shock and can cause serious injury or death. Extreme caution needs to be exercised while handling this board.
• Avoid contact with the exposed conductor or terminals of components on the board. High voltage is present on
exposed conductor and it may be present on terminals of any components directly or indirectly connected to the AC
line.
• Dangerous voltages and/or currents may be internally generated and accessible at various points across the board.
• Charged capacitors store high voltage, even after the circuit has been disconnected from the AC line.
• Make sure that the power source is off before wiring any connection. Make sure that all connectors are well
connected before the power source is on.
•Follow all laboratory safety procedures established by your employer and relevant safety regulations and guidelines,
such as the ones listed under, OSHA General Industry Regulations - Subpart S and NFPA 70E.
Suitable eye protection must be worn when working with or around demonstration boards. Always
comply with your employer’s policies regarding the use of personal protective equipment.
All components and metallic parts may be extremely hot to touch when electrically active.
2DS1003RD4
CRD1616-8W
1. INTRODUCTION
The CS1616 is a 230VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1616 uses a digital control algorithm that is optimized for high efficiency and >0.9 power factor over a wide input voltage range (207VAC
to 253VAC). The CS1616 integrates a dimmer compatibility circuit with a constant output current, quasi-resonant
flyback stage. An adaptive dimmer compatibility algorithm controls the dimmer compatibility operation mode to enable flicker-free operation from 0% to 100% output current with leading-edge, trailing-edge, and digital dimmers.
The CRD1616-8W board is optimized to deliver low system cost in a high-efficiency, flicker-free, phase-dimmable,
solid-state lighting (SSL) solution for incandescent lamp replacement applications. The feedback loop is closed
through an integrated digital control system within the IC. Protection algorithms such as output open/ short,
current-sense resistor open/ short, and overtemperature thermistors protect the system during abnormal conditions.
When using the CS1616 for a design that does not require active clamp circuitry, the CLAMP pin should be left
floating. Details of these features are provided in the CS1616/16 data sheet DS961 Single Stage Dimmable OfflineAC/DC Controller for LED Lamps.
The CRD1616-8W board demonstrates the performance of the CS1616. This reference board has been designed
for an output load of 10
This document provides the schematic for the board. It includes oscilloscope screen shots that indicate various operating waveforms. Graphs are also provided that document the performance of the board in terms of Efficiency vs.
Line Voltage, Output Current vs. Line Voltage, and Output Current vs. Dim Angle for the CS1616 dimmable LED
controller IC.
LEDs in series at 250 mA (28V typical).
Extreme caution needs to be exercised while handling this board. This board is to be used by trained professionals
only.
DS1003RD43
4DS1003RD4
600-00657-Z1 REV E
C.LAMBERTC.LAMBERT
SHEET
OFSHEET
ENGINEER
DATE
DRAWN BY
PART #
SHEET
6/4/2013
SCHEM,CRD1616-8W
11
TITLE
SIZE
B
12/17/12A
REV DESCRIPTIONDATE
INITIAL RELEASE
127(681/(6627+(5:,6(63(&,),('
$//5(6,67259$/8(6$5(,12+06
$8;,/,$5<+$5':$5($1'5(/$7(''2&80(176
A1
CHGD C11 TO KEMET PHE426KJ5220JR05.
01/23/13
CHGD C13 TO PANASONIC ECQE4683RJF.
CHGD C2 TO KEMET PHE426KJ5470JR05.
CORRECTED CONNECTION ON D5.
ECO1028
ECO1029 B INCORPORATED ECO1028 CHANGES TO THE BOARD LAYOUT.
02/05/13
ECO1050 C
CHANGED D7, FOOT PRINT CHANGED
02/25/13
ECO1070 C1
CHANGED U1 REV FROM B1 TO A0
04/19/13
DECO1080REMOVED THERMAL PAD FROM U1.4/25/13
ECO1095 E ADD KEEPOUT ON L4, PIN 8 TO PREVENT SHORT OF REMOVED PIN.06/04/13
Notes:1. Tested at nominal input voltage, nominal input frequency, and without a dimmer, after soaking for 15 minutes
2. Compliant with IEC 61000-3-2 Class C < 25 W
3. Average
4. Peak-to-peak
5. Measured with Chroma 66202 Power Analyzer
DS1003RD413
CRD1616-8W
99.5T
#37AWG
(0.12mm)
140.5 T
#37 AWG
(0.12 mm)
25T
#31AWG
(0.226mm)
Primary
4
8
5
6
Auxili ary
7
Secondary
32T
#30AWG
(0.25mm)
A
B
Figure 10. Flyback Transformer Schematic
7. INDUCTOR CONSTRUCTION
The CRD1616-8W provides power factor correction and dimmer compatibility with a constant output current, quasiresonant flyback stage. The following sections describe the flyback transformer installed on the CRD1616-8W.
7.1Flyback Transformer
The flyback transformer stage is a quasi-resonant peak current-regulated DC-DC converter capable of delivering
the highest possible efficiency with constant current output while minimizing line frequency ripple. The auxiliary winding is used for zero-current detection and overvoltage protection.
7.1.1Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)