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CRD1611A-8W

8 Watt Reference Design

Features

• Quasi-resonant Flyback with Constant-current Output

• Flicker-free Dimming

• Line Voltage 230VAC, ±10%

• Rated Input Power: 8.0W

• Rated Output Power: 6.6W

• Output Voltage: 11.0V to 12.6V

• Efficiency: 83% at 550mA for 4

LEDs in Series

• Low Component Count

• Supports Cirrus Logic Product CS1611A

General Description

The CRD1611A-8W reference design demonstrates the

performance of the CS1611A 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, center-cut,

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 on page 6.

ORDERING INFORMATION

CRD1611A-8W-Z 8 Watt Reference Design

Supports CS1611A

2.284 58mm1.181 29.9mm0.652 16.5mm

SEP‘13

DS1014RD3

Summary of content (25 pages)

PAGE 1
CRD1611A-8W CRD1611A-8W 8 Watt Reference Design Features General Description • Quasi-resonant Flyback with Constant-current Output The CRD1611A-8W reference design demonstrates the performance of the CS1611A 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, center-cut, and digital dimmers. The form factor is targeted to fit into many LED bulb applications (A19, PAR).
PAGE 2
CRD1611A-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
CRD1611A-8W 1. INTRODUCTION The CS1611A is a 230VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1611A 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 CS1611A 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
CRD1611A-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 Rev DescripƟon DIODE RECT 400V 0.8A NPB MINIDIP CAP 4700PF ±10% 1000V X7R NPb 1206 CAP 0.1UF ±5% 400V MTL FLM RAD CAP 0.033UF ±10% 400V MTL FLM RDL CAP 6.8uF ±20% 450V ELEC NPb RAD CAP 100uF ±20% 25V EL LO ESR NPb RD CAP 22UF ±20% 35V ELEC RAD CAP 100pF ±5% 50V C0G NPb 0603 CAP 2.2uF ±10% 10V X7R NPb 0805 CAP 0.
PAGE 6
4. BOARD LAYOUT CRD1611A-8W DS1014RD3 Figure 3.
PAGE 7
DS1014RD3 7 CRD1611A-8W Figure 4.
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CRD1611A-8W DS1014RD3 Figure 5.
PAGE 9
DS1014RD3 9 CRD1611A-8W Figure 6.
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CRD1611A-8W DS1014RD3 Figure 7.
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CRD1611A-8W 5. THERMAL IMAGING Figure 8. Top Thermal Figure 9.
PAGE 12
CRD1611A-8W 6. DIMMER COMPATIBILITY PAR 16 Lamp with a CS1611A (230V/50Hz) Date Power Factor1,5 9/5/2013 0.907 Vendor Cirrus Logic IEC-61000-3-2 Compliant (Y/N) Input Voltage 230V/50Hz EN55015 Compliant (Y/N) 2,5 Y Y (W)1,5 Form Factor PAR 16 Nominal Input Power Model # CRD1611A-8W Maximum Input Power (W)1,5 7.55 8.8 (V)1,3 11.
PAGE 13
CRD1611A-8W Dimmer 6 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 HPM 700L Leading Edge Y Y Y Y Y Y 86.2 85.2 85.2 1.8 1.8 1.8 HPM LN250T Trailing Edge Y Y Y Y Y N 97.4 95.4 100.0 1.8 1.8 1.8 HPM LN400L Leading Edge Y Y Y Y Y Y 76.9 76.8 86.7 1.8 1.8 1.8 HPM XL1000T Trailing Edge Y Y Y Y Y Y 100.0 99.1 97.8 1.8 1.8 1.
PAGE 14
CRD1611A-8W 7. INDUCTOR CONSTRUCTION The CRD1611A-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 CRD1611A-8W. 7.
PAGE 15
CRD1611A-8W 7.2 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 11.
PAGE 16
CRD1611A-8W 8. PERFORMANCE PLOTS 0.6 0.5 Output Current (A) 0.4 0.3 0.2 0.1 0 20 40 60 80 100 120 140 160 180 160 180 Dim Angle (°) Figure 12. Typical Output Current vs. Dim Angle 10 9 8 Input Power (W) 7 6 5 4 3 2 1 0 20 40 60 80 100 120 140 Dim Angle (°) Figure 13. Typical Input Power vs.
PAGE 17
CRD1611A-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 14. Output Current vs. Line Voltage, 207VAC to 253VAC 90% 85% Efficiency (%) 80% 75% 70% 65% 60% 200 210 220 230 Line Voltage (V) 240 250 260 Figure 15. Typical Efficiency vs.
PAGE 18
CRD1611A-8W 1.00 0.95 0.90 Power Factor 0.85 0.80 0.75 0.70 0.65 0.60 200 210 220 230 240 250 260 Line Voltage (V) Figure 16. Power Factor vs.
PAGE 19
CRD1611A-8W Figure 17. No-dimmer Mode, Startup, 230VAC Figure 18.
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CRD1611A-8W Figure 19. Boost FET Q2 Waveform Figure 20.
PAGE 21
CRD1611A-8W Figure 21. ILED at Maximum Dim Angle, Turn-on Waveforms Figure 22.
PAGE 22
CRD1611A-8W Figure 23.
PAGE 23
CRD1611A-8W 9. CONDUCTED EMI Device Under Test: CRD1611A-8W-Z Operating Conditions: NOMNIAL Test Specification: IEC 61000-3-2 Operator Name: JDW & JCM Scan Settings (1 Range) Frequencies Receiver Settings Start Stop Step Res BW M-Time Atten Preamp 150kHz 30MHz 4.5kHz 9kHz (6dB) 10ms Auto Off Final Measurement Detectors: QP, AV Peaks: 25 Meas Time: 1s Acc. Margin: 6dB dBȝV 80.0 Limits 55022MQP 55022MAV 70.0 60.0 50.0 40.0 Transducer ENV216 Traces PK+ AV 30.0 20.0 10.0 0.
PAGE 24
CRD1611A-8W 10. HARMONIC CONTENT 30 Line Current (mA) 25 20 15 10 IEC 61000-3-2 Class D Limits 5 0 3rd 5th 7th 9th 11th 13th 15th 17th 19th 21st 23rd 25th 27th 29th 31st Line Harmonic Figure 25.
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CRD1611A-8W 11.