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Cirrus Logic, Inc.

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CRD1610A-8W

8 Watt Reference Design

Features

• Quasi-resonant Flyback with Constant-current Output

• Flicker-free Dimming

• Line Voltage 120VAC, ±10%

• Rated Input Power: 8.1W

• Rated Output Power: 6.7W

• Output Voltage: 14.0V to 15.8V

• Efficiency: 84% at 460mA for 5

LEDs in Series

• Low Component Count

• Supports Cirrus Logic Product CS1610A

General Description

The CRD1610A-8W reference design demonstrates the

performance of the CS1610A resonant mode AC/DC

dimmable LED driver IC with a 460mA output driving

5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

CRD1610A-8W-Z 8 Watt Reference Design

Supports CS1610A

2.285 58mm1.181 29.9mm0.59 15mm

SEP‘13

DS1012RD3

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Summary of content (24 pages)

PAGE 1
CRD1610A-8W CRD1610A-8W 8 Watt Reference Design Features General Description • Quasi-resonant Flyback with Constant-current Output The CRD1610A-8W reference design demonstrates the performance of the CS1610A resonant mode AC/DC dimmable LED driver IC with a 460mA output driving 5  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).
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CRD1610A-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.
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CRD1610A-8W 1. INTRODUCTION The CS1610A is a 120VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1610A uses a digital control algorithm that is optimized for high efficiency and > 0.90 power factor over a wide input voltage range (108VAC to 132VAC). The CS1610A 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.
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2. SCHEMATIC ECO 2.32K / 50 &/ $ L1 3.3mH + 1 E1 F1 2A 4 3 LINE - L2 3.3mH BR1 HD02-T & ; 5 8) C1 STTH1R04 & (/(& X) 9 R16 270 2W 0.
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CRD1610A-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 Rev DescripƟon DIODE RECT 200V 0.8A NPB MINIDIP CAP 0.01uF ±10% 250V POLY NPb RAD CAP 0.047uF ±5% 250V POLY NPb RAD CAP 0.1uF ±10% 250V POLY NPb RAD CAP 22uF ±20% 250V 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 0.22uF ±10% 25V X7R NPb 0603 CAP 0.
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4. BOARD LAYOUT CRD1610A-8W DS1012RD3 Figure 3.
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DS1012RD3 7 CRD1610A-8W Figure 4.
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CRD1610A-8W DS1012RD3 Figure 5.
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DS1012RD3 9 CRD1610A-8W Figure 6.
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CRD1610A-8W DS1012RD3 Figure 7.
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CRD1610A-8W 5. THERMAL IMAGING Figure 8. Top Thermal Figure 9.
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CRD1610A-8W 6. DIMMER COMPATIBILITY PAR 16 Lamp with a CS1610A (120V/60Hz) Date 11/15/2012 Power Factor1,4 Vendor Cirrus Logic EN55015 Compliant (Y/N) 0.96 Y 1,4 Input Voltage 120V/60Hz Nominal Input Power (W) 6.94 Form Factor PAR 16 Maximum Input Power (W)1,4 8.5 Model # CRD1610A-8W Output Voltage (V)1,2 12 1,2 IC CS1610A Output Current (mA) 475 Topology Boost/Flyback Output Current Ripple  120Hz (mA)1,3 0 1,4 Isolation (Y/N) Y Efficiency (%) 82.
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CRD1610A-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 AYCL-153P Leading Edge Y Y Y Y Y Y 99.8 99.8 99.8 3.2 3.4 3.2 Lutron CTCL-153P Leading Edge Y Y Y Y Y Y 99.8 99.8 99.8 4.2 4.2 3.8 Lutron DV-600P Leading Edge Y Y Y Y Y Y 99.8 99.8 99.8 2.1 2.1 2.1 Lutron DVCL-153P Leading Edge Y Y Y Y Y Y 99.8 99.
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CRD1610A-8W 7. INDUCTOR CONSTRUCTION The CRD1610A-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 CRD1610A-8W. 7.
PAGE 15
CRD1610A-8W 7.2 Flyback Transformer The flyback transformer stage is a quasi-resonant current-regulated DC-DC Converter capable of delivering the highest possible efficiency at a constant current while minimizing line frequency ripple. The auxiliary winding is used for zero-current detection and overvoltage protection. 4 36T # 35AWG (0.14mm) Primary 5 52T #35 AWG (0.14 mm) B 13T Secondary #32AWG (0.20mm) × 2 A 3 2 13 T # 35AWG (0.14mm) Auxiliary 1 Figure 11. Flyback Transformer Schematic 7.2.
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CRD1610A-8W 8. PERFORMANCE PLOTS 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
CRD1610A-8W 1.00 Output Current (A) 0.80 0.60 0.40 0.20 0.00 100 110 120 130 140 Line Voltage (V) Figure 14. Output Current vs. Line Voltage, 108VAC to 132VAC 90% Efficiency (%) 85% 80% 75% 70% 65% 60% 100 110 120 130 140 Line Voltage (V) Figure 15. Typical Efficiency vs.
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CRD1610A-8W 1.00 0.95 Power Factor 0.90 0.85 0.80 0.75 0.70 0.65 0.60 100 110 120 130 140 Line Voltage (V) Figure 16. Power Factor vs.
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CRD1610A-8W Figure 17. No-dimmer Mode, Startup, 120 VAC Figure 18.
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CRD1610A-8W Figure 19. Boost FET Q2 Waveform Figure 20.
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CRD1610A-8W Figure 21. ILED at Maximum Dim Angle, Turn-on Waveforms Figure 22.
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CRD1610A-8W Figure 23.
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CRD1610A-8W 9. CONDUCTED EMI Device Under Test: CRD1610A-8W-Z Operating Conditions: NOMNIAL Test Specification: IEC 55015 Operator Name: JCM 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: 1s Acc. Margin: 3dB Figure 24.
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CRD1610A-8W 10.