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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 10

LEDs 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

10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

(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

2.028 51.5mm1.004 25.5mm0.65 16.5mm

JUL‘13

DS1002RD3

Summary of content (22 pages)

PAGE 1
CRD1615-8W CRD1615-8W 8 Watt Reference Design Features General Description • Quasi-resonant Flyback with Constant-current Output The CRD1615-8W reference design demonstrates the performance of the CS1615 single stage dimmable AC/DC LED driver IC with a 250mA output driving 10  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 (GU10, A19, PAR, BR).
PAGE 2
CRD1615-8W 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.
PAGE 3
CRD1615-8W 1. INTRODUCTION The CS1615 is a 120VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1615 uses a digital control 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 flyback stage.
PAGE 4
2. SCHEMATIC 5(9 / X+ 6 ( 5 2KP %5 +' 7 9 607 */$66 %5,'*( 5(&7 ) ' (&2 1 5 . : & 3/<)/0 X) /,1( & 07/ 32/< 8) 5 5 N 95 029 ' . 9 4 $2' 1 2+0 &+*' &211(&7,21 21 / % )520 *1' 72 /(' 9( &+*' 8 )520 5(9 % 72 5(9 $ (&2 & 5(029(' 7+(50$/ 3$' )520 8 & ; 5 S) /,1( ( ' 5 .
PAGE 5
CRD1615-8W 3. BILL OF MATERIALS Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 Rev DescripƟon DIODE RECT 200V 0.8A NPB MINIDIP CAP 33uF ±20% 35V ALUM ELEC NPb RAD CAP 0.1uF ±10% 250V MPET NPb RAD CAP 56pF ±5% 50V C0G NPb 0603 CAP 680uF ±20% 35V AL ELEC NPb RAD A CAP 0.047uF ±10% 25V X7R NPb 0603 CAP 100pF ±5% 50V C0G NPb 0603 CAP 2200pf ±10% 2KV X7R NPb 1210 CAP 0.1uF ±10% 25V X7R NPb 0603 CAP 0.047uF ±5% 250V POLY NPb RAD CAP 0.
PAGE 6
4. BOARD LAYOUT CRD1615-8W DS1002RD3 Figure 3.
PAGE 7
DS1002RD3 7 CRD1615-8W Figure 4.
PAGE 8
CRD1615-8W DS1002RD3 Figure 5.
PAGE 9
DS1002RD3 9 CRD1615-8W Figure 6.
PAGE 10
CRD1615-8W DS1002RD3 Figure 7.
PAGE 11
CRD1615-8W 5. THERMAL IMAGING Figure 8. Top Thermal Figure 9.
PAGE 12
CRD1615-8W 6. DIMMER COMPATIBILITY - A19 WITH CS1615 (108V - 132V) Input Power 8.3W 1116/1200 Dimmer Compatibility Date 1/8/2013 Power Factor1,5 Vendor Cirrus Logic EN55015 Compliant (Y/N) Input Voltage/Frequency Form Factor Model # 0.99 Y 1,5 120V/60Hz Nominal Input Power (W) A19 Maximum Input Power (W)2,5 CRD1615-8W Output Voltage (V) 82% Efficiency 8.3 8.5 1,3 27.
PAGE 13
CRD1615-8W Dimmer Type Flicker Free Steady-State Monotonic Dimming Max IOUT (mA) Min IOUT (mA) # of lamps # of lamps # of lamps # of lamps TOTAL 1 5 10 1 5 10 1 5 10 1 5 10 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
PAGE 14
CRD1615-8W 7. TRANSFORMER CONSTRUCTION The CRD1615-8W 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 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.
PAGE 15
CRD1615-8W 8. PERFORMANCE PLOTS 0.3 Output Current (A) 0.28 0.26 0.24 0.22 0.2 108 110 112 114 116 118 120 122 124 126 128 130 132 128 130 132 Line Voltage (V) Figure 11. Output Current vs. Line Voltage 85 84 83 Efficiency (%) 82 81 80 79 78 77 76 75 108 110 112 114 116 118 120 122 124 126 Line Voltage (V) Figure 12. Typical Efficiency vs.
PAGE 16
CRD1615-8W 0.996 0.994 Power Factor 0.992 0.99 0.988 0.986 0.984 0.982 0.98 108 110 112 114 116 118 120 122 124 126 128 130 132 128 130 132 Line Voltage (V) Figure 13. Power Factor vs. Line Voltage 12 10 THD (%) 8 6 4 2 0 108 110 112 114 116 118 120 122 124 126 Line Voltage (V) Figure 14.
PAGE 17
CRD1615-8W 0.3 Output Current (A) 0.25 0.2 Leading Edge 0.15 Trailing Edge 0.1 0.05 0 30 45 60 75 90 105 120 135 150 165 180 Dim Angle (°) Figure 15.
PAGE 18
CRD1615-8W Figure 16. No-dimmer Mode, Startup, 120 VAC Figure 17.
PAGE 19
CRD1615-8W Figure 18. Flyback FET Q4, 120VAC Figure 19.
PAGE 20
CRD1615-8W Figure 20.
PAGE 21
CRD1615-8W 9. CONDUCTED EMI Device Under Test: CRD1615-8W-Z Operating Conditions: NOMINAL Test Specification: EN55022:2010 Operator Name: CAL Scan Settings (1 Range) Frequencies Receiver Settings Start Stop Step Res BW M-Time Atten Preamp 150kHz 30MHz 4.5kHz 9kHz (6dB) 50ms Auto Off Final Measurement Detectors: QP, AV Peaks: 10 Meas Time: See scan settings Acc. Margin: 12dB Figure 21.
PAGE 22
CRD1615-8W 10.