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CRD1611-8W

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 CS1611

General Description

The CRD1611-8W 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. 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

CRD1611-8W-Z 8 Watt Reference Design

Supports CS1611

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

FEB‘12

DS975RD5

Summary of content (25 pages)

PAGE 1
CRD1611-8W CRD1611-8W 8 Watt Reference Design Features General Description • Quasi-resonant Flyback with Constant-current Output The CRD1611-8W 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. The form factor is targeted to fit into many LED bulb applications (A19, PAR).
PAGE 2
CRD1611-8W 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
CRD1611-8W 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
ECO 4.7K 915 L3 RM05-CL01 L1 4.7mH E1 F1 1A 4 BR1 HD04-T 3 LINE - C1 1 2 4 5 C4 ELEC 4.7uF R11 CHANGED U1 PIN 6 & 7 PINNAMES TO NC 2200pF T1 RM06-CL01 3 A7 4 04/30/12 D3 2 E3 1 LED+ SS26-TP C5 ELEC 100uF R5 27K 1% E4 B8 LED- 1 D2 STTH1L06A 12/22/11 1/6/12 CHANGED C5 TO EL LO ESR Z2 P6KE350A 300V 22.1K 2 2 L2 4.7mH Q3 FQN1N50CTA R3 4.7K R10 22 OHM R7 1.50M R14 1.50M C9 X7R 0.33uF C2 0.1UF D5 BAV23S-7-F R8 1.50M 2W 2K R4 R22 69.8K R15 1.
PAGE 5
CRD1611-8W 3. BILL OF MATERIALS _ _ Item 1 2 3 4 5 6 7 8 9 10 11 12 12a 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 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 B1 A A Description 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 NPb RAD CAP 4.
PAGE 6
4. BOARD LAYOUT 1 1 2 1 2 2 1 2 2 2 1 8 4 4 5 1 1 2 3 2 7 1 1 2 2 1 1 2 2 3 2 1 2 1 2 1 CRD1611-8W DS975RD5 Figure 3.
PAGE 7
DS975RD5 7 CRD1611-8W Figure 4.
PAGE 8
Capacitor C12 added between D7 and R1 CRD1611-8W DS975RD5 Figure 5.
PAGE 9
DS975RD5 9 CRD1611-8W Figure 6.
PAGE 10
CRD1611-8W DS975RD5 Figure 7.
PAGE 11
CRD1611-8W 5. THERMAL IMAGING Figure 8. Top Thermal Figure 9.
PAGE 12
CRD1611-8W 6. DIMMER COMPATIBILITY - PAR 16 WITH CS1611 (220V - 240V) Input Power 7.7W Date 972/1008 Efficiency Dimmer Compatibility 82.9% 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 PAR 16 Nominal Input Power (W)1,6 7.7 Model # CRD1611-8W Maximum Input Power (W)2,6 8.8 Y 1,4 11.
PAGE 13
CRD1611-8W 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 14
CRD1611-8W 7. INDUCTOR CONSTRUCTION The CRD1611-8W 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 CRD1611-8W. 7.
PAGE 15
CRD1611-8W 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
CRD1611-8W 8. PERFORMANCE PLOTS 0.6 0.5 Output Current (A) 0.4 0.3 0.2 0.1 0 -0.1 20 40 60 80 100 120 140 160 180 Dim Angle (°) Figure 12. Typical Output Current vs. Dim Angle 12 10 Input Power (W) 8 6 4 2 0 20 40 60 80 100 120 140 160 180 Dim Angle (°) Figure 13. Typical Input Power vs.
PAGE 17
CRD1611-8W 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 90 Efficiency (%) 80 70 60 50 200 210 220 230 240 250 260 Vin (VAC) Figure 15. Typical Efficiency vs.
PAGE 18
CRD1611-8W 1.00 Power Factor 0.90 0.80 0.70 0.60 200 210 220 230 240 250 260 Vin (VAC) Figure 16. Power Factor vs.
PAGE 19
CRD1611-8W Figure 17. No-dimmer Mode, Startup 230VAC Figure 18.
PAGE 20
CRD1611-8W Figure 19. Boost FET, Q2, Waveform Figure 20.
PAGE 21
CRD1611-8W Figure 21. ILED at Maximum Dim Angle, Turn-on Waveforms Figure 22.
PAGE 22
CRD1611-8W Figure 23.
PAGE 23
CRD1611-8W 9. CONDUCTED EMI Device Under Test: CRD1611-8W-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
CRD1611-8W 10. HARMONIC CONTENT 30 25 mA 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.
PAGE 25
CRD1611-8W 11.