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Cirrus Logic, Inc.

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CDB1611-8W

8 Watt Demonstration Board

Features

• Quasi-resonant Flyback with Constant-current Output

• Flicker-free Dimming

• Line Voltage 230VAC, ±10%

• Rated Input Power: 7.7W

• Rated Output Power: 6.4W

• Efficiency: 83% at 550mA, for 4

LEDs in series

• Low Component Count

• Supports Cirrus Logic Product CS1611

General Description

The CDB1611-8W reference design demonstrates the

performance of the CS1611 resonant mode AC/DC

dimmable LED driver IC with a 550mA output driving

4LEDs in series

. It offers best-in-class dimmer

compatibility with leading-edge, trailing-edge, and digital

dimmers.

DIMENSIONS (OVERALL)

Length Width Height

For more information, see Figure 3.

ORDERING INFORMATION

CDB1611-8W-Z 8 Watt Reference Design

Supports CS1611

3.62 91.9mm2.54 64.5mm0.971 24.6mm

FEB‘13

DS978DB4

Summary of content (21 pages)

PAGE 1
CDB1611-8W CDB1611-8W 8 Watt Demonstration Board Features General Description • Quasi-resonant Flyback with Constant-current Output • Rated Input Power: 7.7W The CDB1611-8W reference design demonstrates the performance of the CS1611 resonant mode AC/DC dimmable LED driver IC with a 550mA output driving 4  LEDs in series. It offers best-in-class dimmer compatibility with leading-edge, trailing-edge, and digital dimmers. • Rated Output Power: 6.
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CDB1611-8W 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
CDB1611-8W 1. INTRODUCTION The CS1611 is a 230VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1611 uses a digital control algorithm that is optimized for high efficiency and >0.9 power factor over an input voltage range (207VAC to 253VAC). The CS1611 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.
PAGE 4
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PAGE 5
CDB1611-8W 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 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 Rev A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A B1 A A A Description WIRE 24 AWG SOLID PVC INS BLK NPb DIODE RECT 400V 0.8A NPB MINIDIP CAP 0.1uF ±10% 250V POLY NPb RAD CAP 2.
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4. BOARD LAYOUT CDB1611-8W DS978DB4 Figure 3.
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DS978DB4 7 CDB1611-8W Figure 4.
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CDB1611-8W DS978DB4 Figure 5.
PAGE 9
DS978DB4 9 CDB1611-8W Figure 6.
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CDB1611-8W 5. DIMMER COMPATIBILITY - CS1611 (220V - 240V) Input Power 7.7W Date 972/1008 Efficiency Dimmer Compatibility 83.1% Power Factor1,6 12/20/2011 0.90 (Y/N) 3,6 Vendor Cirrus Logic IEC-61000-3-2 Compliant Input Voltage 230V EN55015 Compliant (Y/N) Y Form Factor CRD1611-8W Nominal Input Power (W)1,6 7.7 Model # CDB1611-8W Maximum Input Power (W)2,6 8.8 Y 1,4 11.
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CDB1611-8W 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 Legrand - Leading/Trailing Edge Y Y Y Y Y Y 476 477 477 9 9 9 24 Leiben - Leading Edge Y Y Y Y Y Y 476 475 476 9 12 12 24 Lonon - Leading Edge Y Y Y Y Y Y 475 475 476 9 9 9 24 Lutron - Leading Edge Y Y Y Y Y Y 476 477 476 9 9 9 24 Lutron - Leading Edge Y Y
PAGE 12
CDB1611-8W 6. INDUCTOR CONSTRUCTION The CDB1611-8W 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 CDB1611-8W. 6.
PAGE 13
CDB1611-8W 6.2 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 winding is used for zero-current detection and overvoltage protection. 4 113T #36 AWG (0.13 mm) Primary 5 67 T # 36AWG (0.13mm) B 10T #27AWG (0.35mm) Secondary A 3 2 10 T # 36AWG (0.13mm) Auxiliary 1 Figure 8.
PAGE 14
CDB1611-8W 7. PERFORMANCE PLOTS 0.6 Output Current (mA) 0.5 0.4 0.3 0.2 0.1 0 -0.1 20 40 60 80 100 120 140 160 180 160 180 Dim Angle (°) Figure 9. Typical Output Current vs. Dim Angle 12 10 Input Power (W) 8 6 4 2 0 20 40 60 80 100 120 140 Dim Angle (°) Figure 10. Typical Input Power vs.
PAGE 15
CDB1611-8W 1.00 Output Current (A) 0.80 0.60 0.40 0.20 0.00 200 210 220 230 240 250 260 Line Voltage (V) Figure 11. Output Current vs. Line Voltage 90 Efficiency (%) 80 70 60 50 200 210 220 230 240 250 260 Vin (VAC) Figure 12. Typical Efficiency vs.
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CDB1611-8W 1.00 Power Factor 0.90 0.80 0.70 0.60 200 210 220 230 240 250 260 Vin (VAC) Figure 13. Power Factor vs.
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CDB1611-8W Figure 14. No-dimmer Mode, Startup 230VAC Figure 15.
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CDB1611-8W Figure 16. Boost FET, Q1, Waveform Figure 17.
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CDB1611-8W Figure 18. ILED at Maximum Dim Angle, Turn-on Waveforms Figure 19.
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CDB1611-8W Figure 20.
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CDB1611-8W 8. REVISION HISTORY Revision Date Changes DB1 FEB 2012 Initial Release. DB2 FEB 2012 Change to schematic and BOM. DB3 AUG 2012 Updated schematic. DB4 FEB 2013 Corrected typographical errors.