Instruction Manual

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Cirrus Logic, Inc.

http://www.cirrus.com

CRD1631-10W

10 Watt Reference Design

Features

• Quasi-resonant Flyback with Constant-current Output

• Independent Regulation for Series 2 Channel Output

• Flicker-free Dimming

• Line Voltage 230VAC, ±10%

• Rated Input Power: 10.12W

• Rated Output Power: 8.05W

• Efficiency: 79.9% for 483mA for 4 White LEDs and

185mA for 5 Red LEDs in Series 2 Channel Output

• Red LEDs Output Voltage: 10V

• White LEDs Output Voltage: 13.1V

• Fast Startup

• Tight LED Current Regulation: < ±5%

• Supports Cirrus Logic Product CS1631

General Description

The CRD1631-10W reference design demonstrates the

performance of the CS1631 resonant mode AC/DC

dimmable LED driver IC with constant current output

driving 483mA for white LEDs and 185mA for red LEDs in

series 2 channel output configuration. It offers best-in-class

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

digital dimmers. Additionally, it offers superior 2 channel

control with single channel LED temperature compensation

for LED color mixing applications. 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

CRD1631-10W-Z 10 Watt Reference Design

Supports CS1631

FEB‘13

DS1005RD2

2.401 60.99mm1.087 27.61mm0.662 16.81mm

Summary of content (25 pages)

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CRD1631-10W CRD1631-10W 10 Watt Reference Design Features General Description • Quasi-resonant Flyback with Constant-current Output The CRD1631-10W reference design demonstrates the performance of the CS1631 resonant mode AC/DC dimmable LED driver IC with constant current output driving 483mA for white LEDs and 185mA for red LEDs in series 2 channel output configuration. It offers best-in-class dimmer compatibility with leading-edge, trailing-edge, and digital dimmers.
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CRD1631-10W 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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CRD1631-10W 1. INTRODUCTION The CS1631 is a 230VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1631 uses a digital control algorithm that is optimized for high efficiency and  0.90 power factor over a wide input voltage range (207VAC to 253VAC). The CS1631 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 ) $ ) $ &% / %0 "$ % $ * $ ! "# ! . / .
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CRD1631-10W 3. BILL OF MATERIALS Reference BR1 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14, C16 C15, C17, C18 C19 C20 C21 C24 D1, D6, D8, D10 D2 D3 D4, D11 D5 D7 D9 D12 D15 FH1 L4 L3 Q1 Q2 Q3 Q4 Q5 R1 R2, R12 R3 R4, R5, R10 R6 R7 R8, R16 R9, R11 R13 R13, R14,R17, R18 R19 R20 R21 R22 R23 R24 R25 R26 R29 R33 TX1 U1 U2 Z2 Description RECT BRIDGE GP 600V 0.5A MINIDIP CAP CER 390PF 50V X7R 10% 0603 CAP CER 1.0UF 25V X7R 10% 0603 CAP CER 0.1UF 25V X7R 10% 0603 CAP FILM 0.022UF 400VDC 5% RADIAL CAP CER 0.
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4. BOARD LAYOUT CRD1631-10W DS1005RD2 Figure 3.
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DS1005RD2 7 CRD1631-10W Figure 4.
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CRD1631-10W DS1005RD2 Figure 5.
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DS1005RD2 9 CRD1631-10W Figure 6.
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CRD1631-10W DS1005RD2 Figure 7.
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CRD1631-10W 5. THERMAL IMAGING Figure 8. Top Thermal Figure 9.
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6. DIMMER COMPATIBILITY - PAR 16 WITH CS1631 (220V - 240V) 10.12W Input Power Date 1083/1170 Dimmer Compatibility Power Factor1,5 10/03/2012 0.904 (Y/N)2,5 Vendor Cirrus Logic IEC-61000-3-2 Compliant Input Voltage/Frequency 230V/50Hz EN55015 Compliant (Y/N) Y Y 1,5 10.12 Form Factor A19 Nominal Input Power (W) Model # CRD1631 Maximum Input Power (W)1,5,6 IC 79.0% Efficiency 10.29 1,3 CS1631 13.08/10.
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DS1005RD2 Flicker Free Steady-state Monotonic Dimming Ch1 Max IOUT Ch1 Min IOUT Ch2 Max IOUT Ch2 Min IOUT (mA) (mA) (mA) (mA) # of Lamps # of Lamps # of Lamps # of Lamps # of Lamps # of Lamps 1 5 10 1 5 10 1 5 10 1 5 10 1 5 10 1 5 10 CLSEN - Leading Edge Y Y Y Y Y Y 468 470 469 13 13 13 189 190 180 9 9 9 29 Dbang - Leading Edge Y Y Y Y Y Y 468 468 469 13 13 13 188 190 180 9 9 9 29 Elro - Motion Sensor Y Y Y Y Y Y 468 468 469
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CRD1631-10W 7. INDUCTOR CONSTRUCTION The CRD1631-10W 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 CRD1631-10W. 7.
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CRD1631-10W 8.1 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. The auxiliary winding is used for zero-current detection and overvoltage protection. 5 144T #38 AWG Primary 10 36T TWR #29 AWG 1 144T #38 AWG Secondary 9 4 3 8T #40 AWG Auxiliary 2 Figure 12. Flyback Transformer Schematic 8.1.
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CRD1631-10W 9. PERFORMANCE PLOTS 0.6 0.5 Current (A) 0.4 0.3 0.2 0.1 0 20 40 60 80 100 120 140 160 180 200 Dim Angle (° ) Leading Edge for White LED Trailing Edge for Red LED Trailing Edge for White LED Leading Edge for Red LED Figure 13. Typical 12 Real Power (W) 10 8 6 4 2 0 20 40 60 80 100 120 Dim Angle (°) Leading Edge Input Power 140 160 180 200 Trailing Edge Input Power Figure 14. Typical Input Power vs.
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CRD1631-10W 0.60 Output Current (A) 0.50 0.40 0.30 0.20 0.10 IWhite IRed 0.00 200 210 220 230 Line Voltage (V) 240 250 260 Figure 15. Output Current vs. Line Voltage 85 84 83 Efficiency (%) 82 81 80 79 78 77 76 75 200 210 220 230 240 250 260 Vin (VAC) Figure 16. Typical Efficiency vs.
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CRD1631-10W 0.98 0.96 Power Factor 0.94 0.92 0.90 0.88 0.86 200 210 220 230 240 250 260 Input Voltage (VAC) Figure 17. Power Factor vs.
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CRD1631-10W Figure 18. No-dimmer Mode, Startup 230VAC Figure 19.
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CRD1631-10W Figure 20. Boost FET, Q1, Waveform Figure 21.
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CRD1631-10W Figure 22. LED Currents at Maximum Dim Angle, Turn-on Waveforms Figure 23.
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CRD1631-10W Figure 24.
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CRD1631-10W 10. CONDUCTED EMI Device Under Test: CRD1631-10W-Z Operating Conditions: NOMINAL Test Specification: EN55022 Operator Name: JC 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: 50ms Acc. Margin: 3dB dBμV 100.0 90.0 Limits 55022MQP 55022MAV 80.0 70.0 60.0 50.0 Transducer ENV216 40.0 Traces PK+ AV 30.0 20.0 10.
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CRD1631-10W 11. HARMONIC CONTENT 30 25 mA 20 15 10 5 0 3rd 5th 7th 9th 11th 13th 15th 17th 19th 21th 23rd 25th 27th 29th 31th Line Harmonic Figure 26.
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CRD1631-10W 12. REVISION HISTORY Revision Date RD1 OCT 2012 Initial Release. RD2 FEB 2013 Final release and corrected typographical error.