Copyright Cirrus Logic, Inc. 2013
(All Rights Reserved)
Cirrus Logic, Inc.
http://www.cirrus.com
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CRD1615-8W
CRD1615-8W
8 Watt Reference Design
Features
• Quasi-resonant Flyback with Constant-current Output
• Flicker-free Dimming
• Line Voltage 108VAC - 132VAC
• Rated Output Power: 7.5W
• Efficiency: ~82% at 250mA for 10LEDs in Series
• Supports Cirrus Logic CS1615
General Description
The CRD1615-8W reference design demonstrates the
performance of the CS1615 single stage dimmable AC/DC
LED driver IC with a 250mA output driving
10LEDs 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
(GU10, A19, PAR, BR).
DIMENSIONS (OVERALL)
Length Width Height
For more information, see Figure 3 on page 6.
ORDERING INFORMATION
CRD1615-8W-Z 8 Watt Reference Design
Supports CS1615
2.02851.5mm1.00425.5mm0.6516.5mm
JUL‘13
DS1002RD3
CRD1615-8W
2DS1002RD3
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 con-
sent 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 PROP-
ERTY 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 MERCHANT-
ABILITY 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, IN-
CLUDING 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.
CRD1615-8W
DS1002RD3 3
1. INTRODUCTION
The CS1615 is a 120VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1615 uses a digital con-
trol algorithm that is optimized for high efficiency and >0.9 power factor over an input voltage range (108VAC to
132VAC). The CS1615 integrates a dimmer compatibility circuit with a constant output current, quasi-resonant fly-
back 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 CRD1615-8W 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 CS1615 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 CS1615/16 data sheet DS961 Single Stage Dimmable Offline
AC/DC Controller for LED Lamps.
The CRD1615-8W board demonstrates the performance of the CS1615. This reference board has been designed
for an output load of 10LEDs in series at 250mA (28.0V typical).
This document provides the schematic for the board. It includes oscilloscope screen shots that indicate various op-
erating 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 CS1615 dimmable LED
controller IC.
Extreme caution needs to be exercised while handling this board. This board is to be used by trained professionals
only.
CRD1615-8W
4DS1002RD3
2. SCHEMATIC
Figure 1. Schematic
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DS1002RD3 5
3. BILL OF MATERIALS
Item Rev DescripƟon Qty Reference Designator MFG MFG P/N
1 DIODE RECT 200V 0.8A NPB MINIDIP 1 BR1 DIODES INC HD02-T
2 CAP 33uF ±20% 35V ALUM ELEC NPb RAD 1 C1 PANASONIC ECA1VHG330
3 CAP 0.1uF ±10% 250V MPET NPb RAD 1 C2 PANASONIC ECQE2104KF
4 CAP 56pF ±5% 50V C0G NPb 0603 2 C3 C8 KEMET NP-C0603C560J5GAC
5 CAP 680uF ±20% 35V AL ELEC NPb RAD 1 C4 PANASONIC EEUFR1V681
6 A CAP 0.047uF ±10% 25V X7R NPb 0603 1 C6 KEMET C0603C473K3RAC
7 CAP 100pF ±5% 50V C0G NPb 0603 1 C7 KEMET NP-C0603C101J5GAC
8 CAP 2200pf ±10% 2KV X7R NPb 1210 1 C9 KEMET C1210C222KGRAC
9 CAP 0.1uF ±10% 25V X7R NPb 0603 1 C10 KEMET C0603C104K3RAC
10 CAP 0.047uF ±5% 250V POLY NPb RAD 1 C11 EPCOS B32529C3473J
11 CAP 0.068uF ±10% 250V MPOLY NPb RAD 1 C13 PANASONIC ECQE2683KB
12 CAP 1000PF ±10% 500V X7R NPb 0805 1 C14 KEMET C0805C102KCRAC
13 DIODE RECT 600V 1A 50mA NPb DO-41 1 D1 DIODES INC 1N4005
14 DIODE 600V 1A NPb SMA DO-214AC 1 D3 MCC GS1J-LTP
15 DIODE SWT 250V 0.4A NPb SOT-23 1 D4 DIODES INC BAV23S-7-F
16 DIODE HS SWT 100V 300mA NPb SOD323 1 D5 MICRO COMMERCIAL 1N4148WX-TP
17 DIODE SCHOTTKY 350mA 30V NPb SOD323 1 D6 MICRO COMMERCIAL SD103BWS-TP
18 DIODE SKY RECT 100V 2A NPb DO-214AC 1 D7 MCC SS210-TP
19 NO POP PAD H40 P64 NPb TH 4 E1 E2 E5 E6 NO POP NP-PAD-H40P64
20 IND 10000uH 0.053A MINI-DRUM NPb TH 1 L1 RENCO RL-5480-3-10000
21 XFMR 2.6mH ±10% 10KHz NPb TH 1 L2 KUNSHAN EAGERNESS EF16-CL01
22 THERM 100K OHM ±5% 0.10mA NPb 0603 1 NTC MURATA NCP18WF104J03RB
23 TRAN MSFET nCH 60V 360mA NPb SOT-23 1 Q1 NXP 2N7002P,215
24 TRAN MOSFET nCH 1.3A 600V NPb DPAK 1 Q2 ALPHA & OMEGA AOD1N60
25 TRAN MOSFET nCH 2.5A 600V NPb DPAK 1 Q4 ALPHA & OMEGA AOD3N60
26 RES 0 OHM 1/10W ±5% NPb 0603 FILM 2 R1 R20 DALE CRCW06030000Z0EA
27 RES 47 OHM 1/10W ±1% NPb 0603 2 R2 R19 PANASONIC ERJ3EKF47R0V
28 RES 3.3K OHM 1W ±5% NPb AXL 1 R3 BC COMPONENTS PR01000103301JR500
29 RES 1k OHM 2W ±5% MTL FLM NPb AXL 1 R4 VISHAY PR02000201001JR500
30 RES 27K OHM 1/8W ±0.1% NPb 0805 1 R5 PANASONIC ERA-6YEB273V
31 RES 2.67 OHM 1/4W ±1% NPb 1206 1 R6 KOA RK73H2BTTD2R67F
32 RES 750k OHM 1/8W ±1% NPb 0805 FILM 2 R7 R8 PANASONIC ERJ6ENF7503V
33 RES 47OHM 2W 1% FUSIBLE MTL NPb AX 1 R9 YAGEO FKN2WSFTF73-47R
34 RES 69.8k OHM 1/10W ±1% NPb 0603 1 R10 DALE CRCW060369K8FKEA
35 RES 499K OHM 1/4W ±1% MTL NPb AXL 1 R11 VISHAY CCF55499KFKE36
36 RES 43.2k OHM 1/10W ±1% NPb 0603 1 R13 DALE CRCW060343K2FKEA
37 RES 82 OHM 1/2W ±5% C FLM NPb AXL 1 R15 KOA CF1/2CT52R820J
38 RES 71.5k OHM 1/10W ±1% NPb 0603 1 R17 DALE CRCW060371K5FKEA
39 RES 14k OHM 1/10W ±1% NPB 0603 FILM 1 R18 DALE CRCW060314K0FKEA
40 RES 2.61k OHM 1/10W ±1% NPb 0603 1 R23 DALE CRCW06032K61FKEA
41 A0 IC CRUS TRIAC DIM PFC 120V NPb SO16 1 U1 CIRRUS LOGIC CS1615-FSZ/A0
42 VARISTOR 240V 210pF 15J 7mm NPb RAD 1 VR1 BOURNS MOV-07D241K
43 DIODE ZENER 500mW 16V NPb SOD123F 1 Z1 NXP NZH16C,115
Figure 2. Bill of Materials
CRD1615-8W
6DS1002RD3
4. BOARD LAYOUT
Figure 3. PCB Dimensions
CRD1615-8W
DS1002RD3 7
Figure 4. Top Silkscreen
CRD1615-8W
8DS1002RD3
Figure 5. Bottom Silkscreen
CRD1615-8W
DS1002RD3 9
Figure 6. Top Routing
CRD1615-8W
10 DS1002RD3
Figure 7. Bottom Routing
CRD1615-8W
DS1002RD3 11
5. THERMAL IMAGING
Figure 8. Top Thermal
Figure 9. Bottom Thermal
CRD1615-8W
12 DS1002RD3
6. DIMMER COMPATIBILITY - A19 WITH CS1615 (108V - 132V)
Input Power 8.3W Dimmer Compatibility 1116 /1200 Efficiency 82%
Date 1/8/2013 Power Factor1,5 0.99
Vendor Cirrus Logic EN55015 Compliant (Y/N) Y
Input Voltage/Frequency 120V/60Hz Nominal Input Power (W)1,5 8.3
Form Factor A19 Maximum Input Power (W)2,5 8.5
Model # CRD1615-8W Output Voltage (V)1,3 27.8
IC CS1615 Output Current (mA)1,3 244
Topology Flyback Output Current Ripple 120Hz (mAp-p)1,4 200
Isolation (Y/N) YOutput Power (W)1,5 6.8
Compatibility Spec 1.0 Efficiency (%) 82
Dimmer Type
Flicker Free
Steady-State
Monotonic
Dimming Max IOUT (mA) Min IOUT (mA)
TOTAL
# of lamps # of lamps # of lamps # of lamps
1 5 10 1 5 10 1 5 10 1 5 10
Cooper - Leading Edge Y Y Y Y Y Y 248 248 248 1 1 1 24
Cooper - Leading Edge Y Y Y Y Y Y 248 248 248 1 1 1 24
Cooper - Leading Edge Y Y Y Y Y Y 245 244 244 1 1 1 24
GE - Leading Edge Y Y Y Y Y Y 248 248 248 1 1 1 24
Leviton - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Leviton - Leading Edge Y Y Y Y Y Y 248 248 248 1 1 1 24
Leviton - Trailing Edge Y Y Y N N N 245 245 246 3 3 1 21
Leviton - Leading Edge Y Y Y Y Y Y 249 249 249 17 16 16 21
Leviton - Leading Edge Y Y Y Y Y Y 250 248 249 1 1 1 24
Leviton - Leading Edge Y N Y Y Y Y 249 249 249 1 1 1 19
Leviton - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Leviton - Leading Edge Y Y Y Y Y Y 246 246 246 1 1 1 24
Leviton - Leading Edge Y Y Y Y Y Y 246 246 246 1 1 1 24
Leviton - Leading Edge Y Y Y Y Y Y 246 246 246 1 1 1 24
Leviton - Trailing Edge Y Y Y Y Y Y 246 245 245 1 1 1 24
Leviton - Leading Edge Y Y Y N Y Y 249 249 249 1 1 1 23
Leviton - Leading Edge Y Y Y Y Y Y 249 249 249 13 13 12 22
Leviton - Leading Edge Y Y Y Y Y Y 248 248 248 1 1 1 24
Leviton - Leading Edge Y Y Y Y Y Y 248 248 248 1 1 1 24
Leviton - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Leviton - Motion Detect Y N N Y Y Y 249 248 248 0 0 0 14
Leviton - Leading Edge Y Y N Y Y Y 249 249 249 1 1 1 19
Lutron - Leading Edge Y Y Y Y Y Y 248 248 248 1 1 1 24
CRD1615-8W
DS1002RD3 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 < 25W
3. Average
4. Peak-to-peak
5. Measured with Chroma 66202 Power Analyzer
Lutron - Leading Edge Y Y Y N N N 249 249 249 1 1 1 21
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 4 3 3 24
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Lutron - Trailing Edge Y Y Y Y Y Y 221 225 224 3 3 1 21
Lutron - Leading Edge Y Y Y Y Y Y 249 248 248 1 1 1 24
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Lutron - Leading Edge Y Y Y Y Y Y 240 240 240 1 1 1 24
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Lutron - Leading Edge Y Y Y Y Y Y 248 248 248 1 1 1 24
Lutron - Leading Edge Y Y N Y Y Y 249 249 249 1 1 1 19
Lutron - Occupancy Sensor Y Y Y Y Y Y 244 244 244 0 0 0 24
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 13 12 123
Lutron - Trailing Edge N N N Y Y Y - - - 3 3 1 6
Lutron - Leading Edge Y Y Y Y Y Y 248 248 248 1 1 1 24
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Lutron - Trailing Edge Y Y Y Y Y Y 190 190 195 1 1 1 21
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Lutron - Leading Edge Y Y N N Y Y 249 250 -13 13 116
Lutron - Leading Edge Y N N Y Y Y 249 249 -15 15 112
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Lutron - Leading Edge Y Y Y Y N N 249 249 249 1 1 1 22
Lutron - Leading Edge Y Y Y Y Y Y 249 249 249 1 1 1 24
Pass & Seymour -
Occupancy Sensor Y Y Y Y Y Y 247 246 247 0 0 0 24
Smarthome - Leading Edge Y Y Y Y Y Y 249 248 249 1 1 1 24
Overall Total 1116
Dimmer Type
Flicker Free
Steady-State
Monotonic
Dimming Max IOUT (mA) Min IOUT (mA)
TOTAL
# of lamps # of lamps # of lamps # of lamps
1 5 10 1 5 10 1 5 10 1 5 10
CRD1615-8W
14 DS1002RD3
7. TRANSFORMER CONSTRUCTION
The CRD1615-8W provides power factor correction and dimmer compatibility with a constant output current, quasi-
resonant flyback stage. The following sections describe the flyback transformer installed on the CRD1615-8W.
7.1 Flyback 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 wind-
ing is used for zero-current detection and overvoltage protection.
7.1.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)
Notes: 1. Time = 2sec.
2. Measured across pins 4 and 5.
3. Measured across pins B and A.
4. Measured across pins 12 and 7.
Parameter Condition Symbol Min Typ Max Unit
Flyback Transformer
Electrical Strength (Note 1) foperate=50/60Hz -3.75-kV
RMS
Primary Inductance (Note 2) fresonant=10kHz, 0.3V at
20°C
LP2.34 2.6 2.86 mH
Primary Leakage Inductance (Note 2) fresonant=10kHz, 0.3V at
20°C
LK--55H
Primary DC Resistance (Note 2)
t
DCR
=20°C
4.64 5.8 6.96
Secondary DC Resistance (Note 3)
t
DCR
=20°C
0.208 0.26 0.312 m
Auxiliary DC Resistance (Note 4)
t
DCR
=20°C
0.44 0.55 0.66 m
Figure 10. Flyback Transformer Schematic
CRD1615-8W
DS1002RD3 15
8. PERFORMANCE PLOTS
0.2
0.22
0.24
0.26
0.28
0.3
108 110 112 114 116 118 120 122 124 126 128 130 132
Output Current (A)
Line Voltage (V)
Figure 11. Output Current vs. Line Voltage
75
76
77
78
79
80
81
82
83
84
85
108 110 112 114 116 118 120 122 124 126 128 130 132
Efficiency (%)
Line Voltage (V)
Figure 12. Typical Efficiency vs. Line Voltage
CRD1615-8W
16 DS1002RD3
Figure 13. Power Factor vs. Line Voltage
0.98
0.982
0.984
0.986
0.988
0.99
0.992
0.994
0.996
108110112114116118120122124126128130132
Power Factor
Line Voltage (V)
Figure 14. THD vs Line Voltage
0
2
4
6
8
10
12
108 110 112 114 116 118 120 122 124 126 128 130 132
THD (%)
Line Voltage (V)
CRD1615-8W
DS1002RD3 17
Figure 15. Typical Output Current vs Dim Angle
0
0.05
0.1
0.15
0.2
0.25
0.3
30 45 60 75 90 105 120 135 150 165 180
Output Current (A)
Dim Angle (°)
Leading Edge
Trailing Edge
CRD1615-8W
18 DS1002RD3
Figure 16. No-dimmer Mode, Startup, 120 VAC
Figure 17. No-dimmer Mode, Steady-state, 120VAC
CRD1615-8W
DS1002RD3 19
Figure 18. Flyback FET Q4, 120VAC
Figure 19. Leading-edge Dimmer Mode, Steady-state, 120VAC
CRD1615-8W
20 DS1002RD3
Figure 20. Trailing-edge Dimmer Mode, Steady-state, 120VAC
CRD1615-8W
DS1002RD3 21
9. CONDUCTED EMI
Device Under Test: CRD1615-8W-Z Operating Conditions: NOMINAL
Test Specification: EN55022:2010 Operator Name: CAL
Scan Settings (1 Range)
Final Measurement
Detectors: QP, AV Peaks: 10 Meas Time: See scan settings Acc. Margin: 12dB
Final Measurement Results
Frequencies Receiver Settings
Start Stop Step Res BW M-Time Atten Preamp
150kHz 30MHz 4.5kHz 9kHz (6dB) 50ms Auto Off
Trace Frequency
(MHz)
Level
(dBV)
Limit
(dBV)
Delta Limit
(dB)
Delta Ref
(dB) Comment
1QP 0.15 58.05 66.00 -7.95 N/on
2AV 10.0005 41.04 50.00 -8.96 N/on
* = Limit Exceeded
Figure 21. Conducted EMI
CRD1615-8W
22 DS1002RD3
10.REVISION HISTORY
Revision Date Changes
RD1 FEB 2013 Final release
RD2 APR 2013 Context clarification
RD3 JUL 2013 Content updated using PCBA Rev C
Mouser Electronics
Authorized Distributor
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CRD1615-8W-Z