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AN398

Design Example of CS1610

for 15W Dimmer-Compatible SSL Circuit

Features

• Supports Cirrus Logic CS1610

• Quasi-resonant Flyback Topology with Constant-

current Output

• Flicker-free Dimming

• Line Voltage 108VAC - 132VAC

• Rated Input Power: 15W

• Rated Output Power: 13.2W

• Efficiency: ~81% at 470mA for 9xLEDs in Series

• Low Component Count

General Description

This application note provides an example of a Solid State

Lighting (SSL) LED lamp circuit designed using Cirrus

Logic’s CS1610, the CRD1610-15W-27V. The CRD1610-

15W-27V reference design demonstrates the performance

of the CS1610 resonant mode AC/DC LED driver IC with a

470mA output driving

9xLEDs in series

. It offers best-in-

class dimmer compatibility and minimum dimming

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

dimmers. The form factor is targeted to fit into many LED

bulb applications (A19-type, PAR).

AUG‘14

AN398

Summary of content (15 pages)

PAGE 1
AN398 Design Example of CS1610 for 15W Dimmer-Compatible SSL Circuit Features General Description • Supports Cirrus Logic CS1610 This application note provides an example of a Solid State Lighting (SSL) LED lamp circuit designed using Cirrus Logic’s CS1610, the CRD1610-15W-27V. The CRD161015W-27V reference design demonstrates the performance of the CS1610 resonant mode AC/DC LED driver IC with a 470mA output driving 9xLEDs in series.
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AN398 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
AN398 1. INTRODUCTION The CS1610 is a 120VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1610 uses a digital control algorithm that is optimized for high efficiency and > 0.90 power factor over an input voltage range (108VAC to 132VAC). The CS1610 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 AN398 Figure 1.
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AN398 3.
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4. BOARD LAYOUT AN398 Figure 2.
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AN398 Figure 3.
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AN398 Figure 4.
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AN398 Figure 5.
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AN398 5. THERMAL IMAGING Figure 6. Top Thermal Figure 7.
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AN398 6. DIMMER COMPATIBILITY A19 Lamp with a CS1615A (120V/60Hz) Date 9/10/2012 Power Factor1,4 Vendor Cirrus Logic EN55015 Compliant (Y/N) Input Voltage Form Factor 0.934 N 1,4 120V/60Hz Nominal Input Power (W) 16 1,4 N/A 16 Maximum Input Power (W) 1,2 Model # CRD1610-15WA Output Voltage (V) IC CS1610 Output Current (mA)1,2 460 Topology Flyback Output Current Ripple  120Hz (mA)1,3 50 Isolation (Y/N) Y Efficiency (%) 80.6 Dimmer 5 Manufacture Type Output Power 28.
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AN398 Dimmer 5 Manufacture Type Flicker Free Steady-State Monotonic Dimming Max Iout (mA) Min Iout (mA) # of lamps # of lamps # of lamps # of lamps 1 5 10 1 5 10 1 5 10 1 5 10 Lutron GL-600P Leading Edge Y Y Y Y Y Y 457 457 457 10 10 10 Lutron MAW-600 Leading Edge Y Y Y Y Y Y 456 457 458 10 10 10 Lutron MIR-600 Leading Edge Y Y Y Y Y Y 457 456 458 10 10 10 Lutron NT-2000 Leading Edge Y Y Y Y Y Y 457 457 457 10 10 10 Lutron NTELV-6
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AN398 6. PERFORMANCE PLOTS 0.5 0.49 Output Current (A) 0.48 0.47 0.46 0.45 0.44 0.43 0.42 0.41 0.4 108 120 Line Voltage (V) 132 Figure 8. Output Current vs. Line Voltage 100% Efficiency (%) 95% 90% 85% 80% 75% 108 120 132 Line Voltage (V) Figure 9. Typical Efficiency vs.
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AN398 1 0.95 Power Factor 0.9 0.85 0.8 0.75 0.7 0.65 0.6 108 120 132 Line Voltage (V) Figure 10. Power Factor vs. Line Voltage 14 12 Real Power 10 8 Leading - 120 - 60 6 Trailing - 120 - 60 4 2 0 15 30 45 60 75 90 105 120 135 150 165 180 Dim Angle Figure 11.
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AN398 7.