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Cirrus Logic, Inc.

http://www.cirrus.com

CRD1616A-11W-30V

AN404

Design Example of CS1616A

for 11W Dimmer-Compatible SSL Circuit

Features

• Supports Cirrus Logic CS1616A

• Quasi-resonant Flyback Topology with Constant-

current Output

• Flicker-free Dimming

• Line Voltage: 207VAC - 253VAC

• Rated Input Power: 11W

• Rated Output Power: 5W

• Efficiency: ~82% at 300mA for 10xLEDs 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 CS1616A, the CRD1616A-11W-30V. The

CRD1616A-11W-30V reference design demonstrates the

performance of the CS1616A resonant mode AC/DC LED

driver IC with a 300mA output driving

10xLEDs 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

AN404

Summary of content (15 pages)

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AN404 Design Example of CS1616A for 11W Dimmer-Compatible SSL Circuit Features General Description • Supports Cirrus Logic CS1616A This application note provides an example of a Solid State Lighting (SSL) LED lamp circuit designed using Cirrus Logic’s CS1616A, the CRD1616A-11W-30V. The CRD1616A-11W-30V reference design demonstrates the performance of the CS1616A resonant mode AC/DC LED driver IC with a 300mA output driving 10xLEDs in series.
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AN404 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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AN404 1. INTRODUCTION The CS1616A is a 230VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1616A uses a digital control algorithm that is optimized for high efficiency and > 0.90 power factor over an input voltage range (207VAC - 253VAC). The CS1616A integrates a dimmer compatibilty circuit with a constant output current, quasi-resonant flyback stage.
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2. SCHEMATIC AN404 Figure 1.
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AN404 3. BILL OF MATERIALS Part Value Package Part Value Package C1 100nF/400V CBB104-10*4.5 Q4 2N7002P,215 SOT23 C2 33nF/400V CBB104-10*4.5 R1 47R 2W FUSE-RESISTOR C3 68nF/400V CBB104-10*4.5 R2 47R 2W 0309V-SS C4 471 400V C1206 R3 24 R0805 C5 1u/25V C0603 R4 220K R0805 C6 1u/25V C0603 R5 220K R0805 C7 47pf/25V C0603 R7 1.5M R1206 C8 680u/35V CAP-E20-10 R8 1.
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4. BOARD LAYOUT Figure 2.
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Figure 3.
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Figure 4.
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Figure 5.
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AN404 5. THERMAL IMAGING Figure 6. Top Thermal Figure 7.
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AN404 6. DIMMER COMPATIBILITY Lamp with a CS1616A (230V/50Hz) Date 9/26/2013 Power Factor1,4 Vendor Cirrus Logic EN55015 Compliant (Y/N) Input Voltage 1,4 Maximum Input Power (W) CRD1616A-11W-30V IC CS1616A Topology Y Efficiency (%) 84.3% Dimmer 5 Manufacture Type Output Voltage (V) 11 1,2 Output Current (mA) 30.943V 1,2 280 Output Current Ripple  120Hz Flyback Isolation (Y/N) 10.28 Nominal Input Power (W) NA Model # N 1,4 230V/50Hz Form Factor 0.
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AN404 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 1 1 1 HPM XL1000T Trailing Edge Y Y 270 7 HPM LN250T Trailing Edge N Y 258 8 Jung 1254UDE Leading Edge Y Y 307 10 Legrand 67085 Trailing Edge Y Y 281 2 Leiben 450W Leading Edge Y Y 278 8 Lonon NB 50.
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AN404 7. PERFORMANCE PLOTS 0.31 ILED Current (A) 0.3 0.29 0.28 0.27 0.26 207 215 223 230 237 245 253 Line Voltage (V) Figure 8. Output Current vs. Line Voltage 90 89 88 Efficiency(%) 87 86 85 84 83 82 81 80 207 215 223 230 237 245 253 Line Voltage (V) Figure 9. Typical Efficiency vs.
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AN404 1 0.99 0.98 Power Factor 0.97 0.96 0.95 0.94 0.93 0.92 0.91 0.9 207 215 223 230 237 245 253 Line Voltage (V) Figure 10. Power Factor vs. Line Voltage 0.35 0Leading Edge 1Trailing Edge 0.3 LED Current (A) 0.25 0.2 0.15 0.1 0.05 0 30 55 80 105 Dim Angle 130 155 180 Figure 11. Output Current vs.
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AN404 8.