To p
Bottom
CRD1610-8W
2.284 58mm1.181 29.9mm0.59 15mm
8 Watt Reference Design
CRD1610-8W
Features
• Quasi-resonant Flyback with Constant-current Output
• Flicker-free Dimming
• Line Voltage 120VAC, ±10%
• Rated Input Power: 8.1 W
• Rated Output Power: 6.7W
• Output Voltage: 14.0V to 15.8V
• Efficiency: 84% at 460mA, for 5
• Low Component Count
• Supports Cirrus Logic Product CS1610
LEDs in Series
General Description
The CRD1610-8W reference design demonstrates the
performance of the CS1610 resonant mode AC/DC
dimmable LED driver IC with a 460mA output driving
5LEDs in series
compatibility with leading-edge, trailing-edge, and digital
dimmers. The form factor is targeted to fit into many LED
bulb applications (A19, PAR).
DIMENSIONS (OVERALL)
Length Width Height
For more information, see Figure 3.
ORDERING INFORMATION
CRD1610-8W-Z 8 Watt Reference Design
. It offers best-in-class dimmer
Supports CS1610
Cirrus Logic, Inc.
http://www.cirrus.com
Copyright Cirrus Logic, Inc. 2013
(All Rights Reserved)
FEB‘13
DS974RD5
CRD1610-8W
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, 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.
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.
2 DS974RD5
CRD1610-8W
1. INTRODUCTION
The CS1610 is a 120VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1610 uses a digital control algorithm that is optimized for high efficiency and ≥ 0.90 power factor over a wide input voltage range (108VAC
to 132VAC). The CS1610 integrates a critical conduction mode (CRM) boost converter that provides power factor
correction and dimmer compatibility with a constant output current, quasi-resonant flyback stage. An adaptive dimmer compatibility algorithm controls the boost stage and dimmer compatibility operation mode to enable flicker-free
operation to <2% output current with leading-edge, trailing-edge, and digital dimmers.
The CRD1610-8W 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. The variation in switching frequency also provides a
spread-frequency spectrum, thus minimizing the conducted EMI filtering requirements. Protection algorithms such
as output open /short, current-sense resistor open /short, and overtemperature thermistors protect the system during
abnormal conditions. Details of these features are provided in the CS1610 data sheet.
The CRD1610-8W board demonstrates the performance of the CS1610. This reference board has been designed
for an output load of 5
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 CS1610 dimmable LED
controller IC. Extreme caution needs to be exercised while handling this board. This board is to be used by trained
professionals only.
LEDs in series at 460mA (14.6V typical).
DS974RD5 3
600-00544-Z1 Rev A2
K. WANK. WAN
SHEET
OFSHEET
ENGINEER
DATE
DRAWN BY
PART #
SHEET
5/2/2012
SCHEM.,CRD1610-8W
11
TITLE
SIZE
B
11/30/11A
REV DESCRIPTION DATE
INITIAL RELEASE
NOTES: UNLESS OT HERWISE SPECIFIED:
1. ALL RESISTO R VALUES ARE IN OHMS.
AUXILIA RY HARDWARE AN D RELATED DOCUMENTS:
A1
ECO919 CHANGED C5 TO LO ESR, CHANGED R26 TO 2K. 1/12/12
A2
ECO958 CHANGE U1 SYMBOL PIN NAMES 6(SDA) & 7(SCL) TO NC 04/30/12
ECO
1
+
3
2
-
4
BR1
HD02-T
C1
0.01uF
250V
C2
0.047uF
250V
C3
0.1uF
250V
L1
3.3mH
R2 2.32K
R1 1.5K
4
3
2
1
7A
8
B
T1
RM06-CL03A
2
1
5
4
L3
RM05-CL02A
D1
STTH1R04
C4
22uF
ELEC
250V
1
BSTAU X
2
IAC
3
CLAMP
4
SGND
5
SOURCE
6
NC
7
NC
8
IPK
9
FBGAIN
10
EOTP
11
FBSENSE
12
GND
13
GD
14
VDD
15
FBAUX
16
BSTOUT
PAD
THERM
U1
CS1610-FSZ
12
Z2
P6KE250CA
250V
12
D2
STTH1R04A
CY 2200pF
12
D3
SS26-TP
R5
27K
1%
R16
470
2W
D7
S1G-13-F
D4
1N4148W
Z1
SMAZ16-TP
16V
C8
0.22UF
X7R
R15
750K
R14
750K
R7
750K
R8
750K
R11 22.1K
R17
24K
R13
59K
D5
BAV23S-7-F
R10
22 OHM
C9
0.68UF
X7R
C6
22uF
ELEC
D8
SBR130S3-7
D6
SBR130S3-7
R12
51 OHM
Q1
ZVN4106FTA
G
D
S
Q2
STN3N40K3
R9 47 OHM
R24
47 OHM
C10
4.7UF
X7R
R3
4.7K
Q3
FQN1N50CTA
R19 47 OHM
R18
14.0K
-t
NTC
100K
C7
100pF
COG
R20 1K
R21
5.49
1%
R23
4.7K
R22
69.8K
Q4
STD1NK60T4
C11
47pF
C0G
NO POP
PCB DWG-
240-00544-Z1
ASSY DWG-
603-00544-Z1
SCHEMATIC DWG
600-00544-Z1
LBL SUBASSY PROD ID AND REV
422-00013-01
E1
LINE
E2
NEUTRAL
E3
LED+
E4
LED-
C5
100uF
ELEC
R6
470
2W
C12
0.033uF
250V
L2
3.3mH
C13
0.068UF
X7R
R26
2K
2W
F1 2A
R4
2K
2W
Figure 1. Schematic
4 DS974RD5
2. SCHEMATIC
CRD1610-8W
3. BILL OF MATERIALS
CIRRUS LOGIC
CRD1610-8W_Rev_A.bom
BILL OF MATERIAL
1A
2A
3A
4A
5A
6A
7A
8A
9A
10 A
11 A
12 A
13 A
14 A
15 A
16 A
17 A
18 A
19 A
20 A
21 A
22 A
23 A
24 A
25 A
26 A
27 A
28 A
29 A
30 A
31 A
32 A
33 A
34 A
35 A
36 A
37 A
38 A
39 A
40 A
41 A
42 A
43 A
44 A
45 A
46 A
47 A
48 A
49 A
50 B1
51 A
52 A
CRD1610-8W
Item Rev
DS974RD5 5
Description Qty Reference Designator MFG MFG P/N
DIODE RECT 200V 0.8A NPB MINIDIP 1 BR1 DIODES INC HD02-T
CAP 0.01uF ±10% 250V POLY NPb RAD 1 C1 EPCOS B32529C3103K
CAP 0.047uF ±5% 250V POLY NPb RAD 1 C2 EPCOS B32529C3473J
CAP 0.1uF ±10% 250V POLY NPb RAD 1 C3 EPCOS B32529C3104K
CAP 22uF ±20% 250V ELEC NPb RAD 1 C4 NICHICON UVY2E220MPD
CAP 100uF ±20% 25V EL LO ESR NPb RD 1 C5 PANASONIC EEUFM1E101
CAP 22uF ±20% 35V ELEC NPb RAD 1 C6 PANASONIC EEA-GA1V220H
CAP 100pF ±5% 50V C0G NPb 0603 1 C7 KEMET C0603C101J5GAC
CAP 0.22uF ±10% 25V X7R NPb 0603 1 C8 TDK C1608X7R1E224K
CAP 0.68uF ±10% 50V X7R NPb 0805 1 C9 KEMET C0805C684K5RAC
CAP 4.7uF ±10% 25V X7R NPb 0805 1 C10 TDK C2012X7R1E475K
CAP 47pF ±5% 1000V C0G NPb 1206 0 C11 JOHANSON DIELECTRICS 102R18N470JV4E
CAP 0.033uF ±10% 250V POLY NPb RAD 1 C12 EPCOS B32529C3333K
CAP 0.068uF ±10% 250V X7R NPb 1206 1 C13 KEMET C1206C683KARAC
CAP 2200PF +80/-20% 2KV CER NPb RAD 1 CY MURATA DEBE33D222ZA2B
DIODE FAST 400V 1A NPb DO-41 1 D1 ST MICROELECTRONICS STTH1R04
DIODE FAST 400V 1A NPb SMA 1 D2 ST MICROELECTRONICS STTH1R04A
DIODE SKY RECT 60V 2A NPb DO-214AC 1 D3 MICRO COMMERCIAL(MCC) SS26-TP
DIODE FAST SW 75V 350mW NPb SOD123 1 D4 DIODES INC 1N4148W-7-F
DIODE SWT 250V 0.4A NPb SOT-23 1 D5 DIODES INC BAV23S-7-F
DIODE RECT 30V 1A NPb SOD-323 2 D6 D8 DIODES INC SBR130S3-7
DIODE RECT 400V 1A NPb SMA 1 D7 DIODES INC S1G-13-F
FUSE 2A 125V VFA NPb AXL 1 F1 LITTELFUSE 0251002.MXL
IND 3.3mH ±10% 11.8OHM DCR NPb TH 2 L1 L2 COILCRAFT RFB0807-332L
XFMR 1.45mH 10% NPb TH 1 L3 KUNSHAN EAGERNESS RM05-CL02A
THERM 100K OHM ±5% 0.10mA NPb 0603 1 NTC MURATA NCP18WF104J03RB
TRAN MOSFET nCH 60V.2A NPb SOT23-3 1 Q1 DIODES INC ZVN4106FTA
TRAN MOSFT nCH 1.8A 400V NPb SOT223 1 Q2 ST MICROELECTRONICS STN3N40K3
TRAN MOSFET nCH 0.38A 500V NPb TO92 1 Q3 FAIRCHILD FQN1N50CTA
TRAN MOSFET nCH 1.0A 600V NPb DPAK 1 Q4 ST MICROELECTRONICS STD1NK60T4
RES 1.5k OHM 1/4W ±1% NPb 1206 1 R1 DALE CRCW12061K50FKEA
RES 2.32k OHM 1/4W ±1% 1206 FILM 1 R2 DALE CRCW12062K32FKEA
RES 4.70K OHM 1/10W ±1% NPb 0603 2 R3 R23 PANASONIC ERJ3EKF4701V
RES PWR 2.0K OHM 2W ±5% NPb AXL 1 R4 VISHAY PR02000202001JR500
RES 27K OHM 1/8W ±1% NPb 0805 1 R5 PANASONIC ERJ6ENF2702V
RES 470 OHM 2W ±5% MTL FLM NPb AXL 2 R6 R16 VISHAY PR02000204700JR500
RES 750k OHM 1/4W ±1% NPb 1206 FILM 4 R7 R8 R14 R15 DALE CRCW1206750KFKEA
RES 47 OHM 1/10W ±1% NPb 0603 3 R9 R19 R24 PANASONIC ERJ3EKF47R0V
RES 22.0 OHM 1/10W ±1% NPb 0603 1 R10 PANASONIC ERJ3EKF22R0V
RES 22.1k OHM 1/10W ±1% NPb 0603 1 R11 DALE CRCW060322K1FKEA
RES 51.0 OHM 1/10W ±1% NPb 0603 1 R12 PANASONIC ERJ3EKF51R0V
RES 59k OHM 1/10W ±1% NPb 0603 FILM 1 R13 DALE CRCW060359K0FKEA
RES 24k OHM 1/10W ±1% NPb 0603 FILM 1 R17 DALE CRCW060324K0FKEA
RES 14k OHM 1/10W ±1% NPB 0603 FILM 1 R18 DALE CRCW060314K0FKEA
RES 1k OHM 1/10W ±1% NPb 0603 FILM 1 R20 DALE CRCW06031K00FKEA
RES 5.49 OHM 1/4W ±1% NPb 1206 FLM 1 R21 DALE CRCW12065R49FKEA
RES 69.8k OHM 1/10W ±1% NPb 0603 1 R22 DALE CRCW060369K8FKEA
RES PWR 2.0K OHM 2W ±5% NPb AXL 1 R26 VISHAY PR02000202001JR500
XFMR 3.1mH 10% NPb TH 1 T1 KUNSHAN EAGERNESS RM06-CL03A
IC CRUS DIMMER LED DRVR NPb SOIC16 1 U1 Cirrus Logic CS1610-FSZ/B1
DIODE ZENER 16V 1W NPb DO-214AC 1 Z1 MICRO COMMERCIAL SMAZ16-TP
DIODE TVS 250V 600W BID NPb AXL 1 Z2 ST MICROELECTRONICS P6KE250CA
Figure 2. Bill of Materials
6 DS974RD5
4. BOARD LAYOUT
Figure 3. PCB Dimensions
CRD1610-8W
DS974RD5 7
Figure 4. Top Silkscreen
CRD1610-8W
8 DS974RD5
Figure 5. Bottom Silkscreen
CRD1610-8W
DS974RD5 9
Figure 6. Top Routing
CRD1610-8W
10 DS974RD5
Figure 7. Bottom Routing
CRD1610-8W
5. THERMAL IMAGING
CRD1610-8W
Figure 8. Top Thermal
Figure 9. Bottom Thermal
DS974RD5 11
CRD1610-8W
6. DIMMER COMPATIBILITY - PAR 16 WITH CS1610 (108V - 132V)
Input Power 8.3W Dimmer Compatibility 836/888 Efficiency 84.3%
Date
12/19/2011 Power Factor
1,5
0.91
Vendor Cirrus Logic EN55015 Compliant (Y/N) Y
Input Voltage
Form Factor
Model #
IC
Topology
Isolation (Y/ N)
120V Nominal Input Power (W)
PAR 16 Maximum Input Power (W)
CRD1610-8W Output Voltage (V)
CS1610 Output Current (mA)
Boost/Flyback
Output Current Ripple
Y Output Power (W)
1,3
1,3
120Hz (mA)
1,5
1,5
2,5
1,4
8.3
8.5
14.8
470
0
7.0
Compatibility Spec. 1.0 Efficiency (%) 84.3
Dimmer Type
Cooper - Leading Edge
Cooper - Leading Edge
GE - Leading Edge
Leviton - Leading Edge
Leviton - Leading Edge
Leviton - Trailing Edge
Leviton - Trailing Edge
Leviton - Leading Edge
Leviton - Leading Edge
Leviton - Leading Edge
Leviton - Leading Edge
Leviton - Trailing Edge
Leviton - Leading Edge
Leviton - Leading Edge
Leviton - Leading Edge
Leviton - Leading Edge
Leviton - Occupancy Sensor
Leviton - Leading Edge
Lutron - Leading Edge
Lutron - Leading Edge
Flicker Free
Steady-state
# of Lamps # of Lamps # of Lamps # of Lamps
1 5 10 1 5 10 1 5 10 1 5 10
Y Y Y Y Y Y 470 470 469 14 14 22 23
Y Y Y Y Y Y 470 470 470 9 9 9 24
Y Y Y Y Y Y 470 469 470 9 9 9 24
Y Y N Y Y Y 469 469 470 10 11 11 19
Y Y Y Y Y Y 469 468 469 9 9 9 24
Y Y Y Y Y Y 469 469 469 11 10 9 24
Y Y N Y Y Y 469 469 470 63 60 56 16
Y Y Y Y Y Y 469 469 469 9 9 9 24
Y Y N Y Y Y 469 469 469 9 9 9 19
Y Y Y Y Y Y 470 469 471 9 9 9 24
Y Y Y Y Y Y 470 469 470 9 9 9 24
Y Y Y Y Y Y 469 469 470 9 9 9 24
Y Y Y Y Y Y 469 470 469 9 9 9 24
Y Y Y Y Y Y 469 469 469 56 54 51 21
Y Y Y Y Y Y 470 470 469 9 9 9 24
Y Y Y Y Y Y 470 469 470 12 13 11 24
Y Y Y Y Y Y 470 470 470 0 0 0 24
Y Y Y Y Y Y 470 469 470 9 9 9 24
Y Y Y Y Y Y 469 470 469 9 9 9 24
Y Y Y Y Y Y 470 469 470 9 9 9 24
Monotonic
Dimming
Max I
(mA) Min I
out
out
(mA)
Total
Lutron - Leading Edge Y Y Y Y Y Y 470 470 469 14 13 11 24
12 DS974RD5
CRD1610-8W
Dimmer Type
Flicker Free
Steady-state
# of Lamps # of Lamps # of Lamps # of Lamps
1 5 10 1 5 10 1 5 10 1 5 10
Monotonic
Dimming
Max I
(mA) Min I
out
out
(mA)
Total
Lutron - Trailing Edge Y Y Y Y Y Y 445 440 435 9 9 9 21
Lutron - Leading Edge Y Y Y Y Y Y 470 469 470 9 9 9 24
Lutron - Leading Edge Y Y Y Y Y Y 469 470 469 9 9 9 24
Lutron - Motion Sensor Y Y Y Y Y Y 470 469 470 0 0 0 24
Lutron - Leading Edge Y Y Y Y Y Y 470 470 470 9 9 9 24
Lutron - Leading Edge Y Y Y Y Y Y 433 427 421 9 9 9 21
Lutron - Leading Edge Y Y Y Y Y Y 470 469 470 9 9 9 24
Lutron - Leading Edge Y Y Y Y Y Y 469 469 469 9 9 9 24
Lutron - Leading Edge Y Y Y Y Y Y 469 469 470 9 9 9 24
Lutron - Trailing Edge Y Y Y Y Y Y 440 435 433 9 9 9 21
Lutron - Leading Edge Y Y Y Y Y Y 469 469 470 9 9 9 24
Lutron - Leading Edge Y Y Y Y Y Y 470 470 469 9 9 9 24
Lutron - Leading Edge Y Y N Y N N 469 470 0 9 9 0 16
Lutron - Leading Edge Y N N Y Y N 469 470 0 9 9 0 12
Lutron - Leading Edge Y Y Y Y Y Y 469 469 470 15 12 11 23
Pass & Seymour - Occupancy
Sensor
Y Y Y Y Y Y 469 469 470 0 0 0 24
Overall Total 836
Notes: 1. Tested at nominal input voltage, nominal input frequency and without a dimmer after soaking for 15 minutes
2. Tested at nominal input voltage, nominal input frequency and with a dimmer after soaking for 15 minutes
3. Average
4. Peak-to-peak
5. Measured with Chroma 66202 Power Analyzer
DS974RD5 13
CRD1610-8W
2
1
5
4
200T
#34AWG
(0.16mm)
22T
#34 AWG
(0.16mm)
Pri mar y
Auxillary
7. INDUCTOR CONSTRUCTION
The CRD1610-8W includes a critical conduction mode (CRM) boost converter that provides power factor correction
and dimmer compatibility with a constant output current, quasi-resonant flyback stage. The following sections describe the boost and flyback inductors installed on the CRD1610-8W.
7.1 Boost Inductor
The CS1610 uses an adaptive dimmer compatibility algorithm to control the boost inductor stage, which guarantees
dimmer compatibility operation plus enables flicker-free operation with leading-edge, trailing-edge, and digital dimmers. The boost auxiliary winding is used for zero-current detection (ZCD) and supplies power to the CS1610.
Figure 10. Boost Inductor Schematic
7.1.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)
Parameter Condition Symbol Min Typ Max Unit
Boost Inductor
f
Primary Inductance (Note 6)
Primary DC Resistance (Note 6)
Auxiliary DC Resistance (Note 7)
Notes: 6. Measured across pins 1 and 2.
7. Measured across pins 5 and 4.
=10kHz, 0.3V at 20°C
resonant
t
DCR
t
DCR
=20°C
=20°C
L
P
1.305 1.45 1.595 mH
3.28 4.1 4.92
0.456 0.57 0.684
14 DS974RD5
CRD1610-8W
36T
#35AWG
(0. 14m m)
52T
#35 AWG
(0.14 mm)
13 T
# 35AWG
(0.14mm)
Pri mar y
4
5
3
1
Auxiliary
2
Secondar y
13T
#32AWG
(0.20mm) ×2
B
A
7.2 Flyback Transformer
The flyback transformer stage is a quasi-resonant current-regulated DC-DC Converter capable of delivering the
highest possible efficiency at a constant current while minimizing line frequency ripple. The auxiliary winding is used
for zero-current detection and overvoltage protection.
Figure 11. Flyback Transformer Schematic
7.2.1 Electrical Specifications
Characteristics conditions:
• Operating temperature range: -25 °C to +120 °C (including coil heat)
Parameter Condition Sym Min Typ Max Unit
Flyback Transformer
f
Electrical Strength (Note 8)
Primary Inductance (Note 9)
Primary Leakage Inductance (Note 9)
Primary DC Resistance (Note 9)
Secondary DC Resistance (Note 10)
Auxiliary DC Resistance (Note 11)
f
resonant
f
resonant
=50/60Hz
operate
=10kHz, 0.3V at
=10kHz, 0.3V at
t
=20°C
DCR
t
=20°C
DCR
t
=20°C
DCR
20°C
20°C
L
P
L
K
-4K-V
2.79 3.1 3.41
-
2.175 2.90 3.625
-
0.3975 0.53 0.6625
-
-
15
0.22
RMS
mH
H
Notes: 8. Time = 2sec.
9. Measured across pins 3 and 4.
10. Measured across pins B and A.
11. Measured across pins 2 and 1.
DS974RD5 15
8. PERFORMANCE PLOTS
0
0.1
0.2
0.3
0.4
0.5
20 40 60 80 100 120 140 160 180
Output Current (A)
Dim Angle (°)
Figure 12. Typical Output Current vs. Dim Angle
Figure 13. Typical Input Power vs. Dim Angle
0
1
2
3
4
5
6
7
8
9
10
20 40 60 80 100 120 140 160 180
Input Power (W)
Dim Angle (°)
CRD1610-8W
16 DS974RD5
CRD1610-8W
Figure 14. Output Current vs. Line Voltage, 108VAC to 132VAC
0.00
0.20
0.40
0.60
0.80
1.00
100 110 120 130 140
Output Current (A)
Line Voltage (V)
60
65
70
75
80
85
90
100 110 114 118 122 126 130 140
Efficiency (%)
Vin (VAC)
Figure 15. Typical Efficiency vs. Line Voltage, 108VAC to 132VAC
DS974RD5 17
CRD1610-8W
Figure 16. Power Factor vs. Line Voltage, 108VAC to 132VAC
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
100 110 120 130 140
Power Factor
Line Voltage (V)
18 DS974RD5
CRD1610-8W
Figure 17. No-dimmer Mode, Startup 120 VAC
Figure 18. No-dimmer Mode, Steady-state, 120VAC
DS974RD5 19
CRD1610-8W
Figure 19. Boost FET, Q2, Waveform
Figure 20. Flyback FET, Q4, Waveform
20 DS974RD5
CRD1610-8W
Figure 21. ILED at Maximum Dim Angle, Turn-on Waveforms
Figure 22. ILED at Medium Dim Angle, Turn-on Waveforms
DS974RD5 21
CRD1610-8W
Figure 23. ILED at Minimum Dim Angle, Turn-on Waveforms
22 DS974RD5
9. CONDUCTED EMI
1 MHz 10 MHz150 kHz 30 MHz
10.0
20.0
30.0
40.0
50.0
60.0
70.0
0.0
80.0
dBȝV
Limit
s
55022MQ
P
55022MAV
Transducer
ENV216
Traces
PK+
A
V
Figure 24. Conducted EMI
Device Under Test: CRD1610-8W-Z Operating Conditions: NOMNIAL
Test Specification: IEC 55022 Class B Operator Name: JCM
Scan Settings (1 Range)
Frequencies Receiver Settings
Start Stop Step Res BW M-Time Atten Preamp
150kHz 30MHz 4.5kHz 9 kHz (6dB) 10ms Auto Off
Final Measurement
Detectors: QP, AV Peaks: 25 Meas Time: 1s Acc. Margin: 6dB
CRD1610-8W
Final Measurement Results
Trace
Frequency
(MHz)
Level
(dB
V)
Limit
(dBV)
Delta Limit
(dB)
Delta Ref
(dB)
1QP 0.15 61.18 66.00 -4.82 Auto L1/on
* = Limit Exceeded
Comment
DS974RD5 23
10.REVISION HISTORY
Revision Date Changes
RD1 DEC 2011 Initial release.
RD2 JAN 2012 Content change to BOM and schematic.
RD3 FEB 2012 Content change to features.
RD4 JUL 2012 Corrected a typographical error.
RD5 FEB 2013 Corrected typographical errors.
CRD1610-8W
24 DS974RD5
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