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CRD1615A-8W

8 Watt Reference Design

Features

• Supports Cirrus Logic CS1615A

• Reduced BOM Cost Compared to CS1615

• Isolated Flyback Topology with Constant-current

Output

• Flicker-free Dimming

• <1% Minimum Dimming Across a Broad Range of

Dimmers

• Line Voltage 108VAC - 132VAC

• Rated Output Power: 7.5W

• Efficiency: ~82% at 250mA for 10

LEDs in Series

• Power Factor >0.99

General Description

The CRD1615A-8W reference design demonstrates the

performance of the CS1615A single stage dimmable

AC/DC LED driver IC with a 250mA output driving

10LEDs in series

The CS1615A is designed to support

a reduced off-chip BOM compared to the CS1615.

offers best-in-class dimmer compatibility and minimum

dimming performance with leading-edge, trailing-edge, and

digital dimmers. The form factor is targeted to fit into many

LED bulb applications (GU10, A19-type, PAR, BR).

DIMENSIONS (OVERALL)

Length Width Height

For more information, see Figure 3 on page 6.

ORDERING INFORMATION

CRD1615A-8W-Z 8 Watt Reference Design

Supports CS1615A

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

AUG‘13

DS1043RD2

Summary of content (21 pages)

PAGE 1
CRD1615A-8W CRD1615A-8W 8 Watt Reference Design Features General Description • Supports Cirrus Logic CS1615A • <1% Minimum Dimming Across a Broad Range of Dimmers The CRD1615A-8W reference design demonstrates the performance of the CS1615A single stage dimmable AC/DC LED driver IC with a 250mA output driving 10  LEDs in series. The CS1615A is designed to support a reduced off-chip BOM compared to the CS1615.
PAGE 2
CRD1615A-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
CRD1615A-8W 1. INTRODUCTION The CS1615A is a 120VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1615A uses a digital control algorithm that is optimized for high efficiency and > 0.99 power factor over an input voltage range (108VAC to 132VAC). The CS1615A integrates a dimmer compatibility circuit with a constant output current, quasi-resonant flyback stage.
PAGE 4
2. SCHEMATIC ( ) 2+0 6 *6 - /73 9 5 %5 9 ) & . & 3/<)/0 X) X) 9 & 07/ 32/< 8) & 12 323 5 5 12 323 12 323 3UL ' 12 323 5 /,1( '(6&5,37,21 $ ,1,7,$/ 5(/($6( $X[ ' '2 127 3238/$7( 5 N 75 (( $ ' '$7( ( /(' 9( 66 /73 9 5(9 / X+ ' 6HF & $/ (/(& X) % 5 . ( 95 029 ' .
PAGE 5
CRD1615A-8W 3. BILL OF MATERIALS Item Rev DescripƟon 1 DIODE RECT 200V 0.8A NPB MINIDIP 2 CAP 0.047uF ±5% 250V POLY NPb RAD 3 CAP 0.068uF ±10% 250V MPOLY NPb RAD 4 CAP 0.15uF ±10% 250V POLY NPb RAD 5 CAP 1uF ±10% 25V X7R NPb 0805 6 A CAP 0.
PAGE 6
4. BOARD LAYOUT CRD1615A-8W DS1043RD2 Figure 3.
PAGE 7
DS1043RD2 7 CRD1615A-8W Figure 4.
PAGE 8
CRD1615A-8W DS1043RD2 Figure 5.
PAGE 9
DS1043RD2 9 CRD1615A-8W Figure 6.
PAGE 10
CRD1615A-8W DS1043RD2 Figure 7.
PAGE 11
CRD1615A-8W 5. THERMAL IMAGING Figure 8. Top Thermal Figure 9.
PAGE 12
CRD1615A-8W 6. DIMMER COMPATIBILITY A19 Lamp with a CS1615A (120V/60Hz) Date 8/12/2013 Power Factor1,4 Vendor Cirrus Logic EN55015 Compliant (Y/N) Input Voltage Form Factor 120V/60Hz 1,4 Maximum Input Power (W) Output Voltage (V) CS1615A Topology Y Efficiency (%) 81.7 Dimmer 5 Manufacture Type 9.0 1,2 Output Current (mA) 29.9 1,2 247 Output Current Ripple  120Hz Flyback Isolation (Y/N) 9.0 Nominal Input Power (W) CRD1615A-8W IC Y 1,4 A19 Model # 0.
PAGE 13
CRD1615A-8W Dimmer 5 Manufacture Type Flicker Free Steady-State Monotonic Dimming Max Iout (%) Min Iout (%) # of lamps # of lamps # of lamps # of lamps 1 5 10 1 5 10 1 5 10 1 5 10 Lutron AY-600P Leading Edge Y Y Y Y Y Y 98.8 97.2 98.8 0.4 0.4 0.4 Lutron CT-600P Leading Edge Y N Y Y Y Y 97.6 97.2 98.4 0.4 0.4 0.4 Lutron CT-603PG Leading Edge N Y Y Y Y Y 81.0 83.0 79.8 0.4 0.4 0.4 Lutron CTCL-153P Leading Edge Y Y Y Y Y Y 95.5 94.7 95.
PAGE 14
CRD1615A-8W 7. TRANSFORMER CONSTRUCTION The CRD1615A-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 CRD1615A-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
CRD1615A-8W 8. PERFORMANCE PLOTS 0.30 Output Current (A) 0.28 0.26 0.24 0.22 0.20 108 110 112 114 116 118 120 122 124 126 128 130 132 128 130 132 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
CRD1615A-8W 1.00 0.99 0.98 Power Factor 0.97 0.96 0.95 0.94 0.93 0.92 0.91 0.90 108 110 112 114 116 118 120 122 Line Voltage (V) 124 126 128 130 132 128 130 132 Figure 13. Power Factor vs. Line Voltage 10 THD (%) 9 8 7 6 5 108 110 112 114 116 118 120 122 124 126 Line Voltage (V) Figure 14.
PAGE 17
CRD1615A-8W 300 Output Current (mA) 250 200 Leading Edge 150 Trailing Edge 100 50 0 35 50 65 80 95 110 125 Dim Angle (o) 140 155 170 180 Figure 15.
PAGE 18
CRD1615A-8W Figure 16. No-dimmer Mode, Startup, 120 VAC Figure 17.
PAGE 19
CRD1615A-8W Figure 18. Leading-edge Dimmer Mode, Steady-state, 120VAC Figure 19.
PAGE 20
CRD1615A-8W 9. CONDUCTED EMI Device Under Test: CRD1615A-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 20.
PAGE 21
CRD1615A-8W 10.