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Cirrus Logic, Inc.

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CRD1615W-11W-36V Schematic

AN400

Design Example of CS1615

for 11W Dimmer-Compatible SSL Circuit

Features

• Supports Cirrus Logic CS1615

• Quasi-resonant Buck-Boost Topology with Constant-

current Output

• Flicker-free Dimming

• Line Voltage: 108VAC -132VAC

• Rated Input Power: 11W

• Rated Output Power: 9.25W

• Efficiency: ~87.5% at 250mA for 12xLEDs 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 CS1615, the CRD1615-11W-36V. The CRD1615-

11W-36V reference design demonstrates the performance

of the CS1615 resonant mode AC/DC LED driver IC with a

250mA output driving

12xLEDs 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

AN400

Summary of content (15 pages)

PAGE 1
AN400 Design Example of CS1615 for 11W Dimmer-Compatible SSL Circuit Features General Description • Supports Cirrus Logic CS1615 This application note provides an example of a Solid State Lighting (SSL) LED lamp circuit designed using Cirrus Logic’s CS1615, the CRD1615-11W-36V. The CRD161511W-36V reference design demonstrates the performance of the CS1615 resonant mode AC/DC LED driver IC with a 250mA output driving 12xLEDs in series.
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AN400 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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AN400 1. INTRODUCTION The CS1615 is a 120VAC quasi-resonant buck-boost mode dimmable LED controller IC. The CS1615 uses a digital control algorithm that is optimized for high efficiency and > 0.90 power factor over an input voltage range (108VAC -132VAC). The CS1615 integrates a dimmer compatibilty circuit with a constant output current, quasi-resonant flyback stage.
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2. SCHEMATIC AN400 Figure 1.
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AN400 3. BILL OF MATERIALS Ref Description Manufacturer Part Number BR1 DIODE RECT 200V 0.8A NPB MINIDIP HD02-T C1 CAP FILM 0.047UF 250VDC RADIAL B32529C3473K C2 CAP FILM 0.068UF 250VDC RADIAL B32529C3683J C3 CAP FILM 0.15UF 250VDC RADIAL B32529C3154J289 C4 CAP CER 0.1UF 25V 10% X7R 0603 GRM188R71E104KA01D C5 CAP CER 0.
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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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AN400 5. THERMAL IMAGING Figure 6. Top Thermal Figure 7.
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AN400 6. DIMMER COMPATIBILITY A19 Lamp with a CS1615A (120V/60Hz) Date 11/20/2013 Power Factor1,4 Vendor Cirrus Logic EN55015 Compliant (Y/N) Input Voltage 1,4 Maximum Input Power (W) CRD1615-11W-36V IC CS1615 Topology N Efficiency (%) 87.5% Dimmer 5 Manufacture Type Output Voltage (V) 11 1,2 Output Current (mA) 36V 1,2 250 Output Current Ripple  120Hz Buck-Boost Isolation (Y/N) 10.57 Nominal Input Power (W) N/A Model # N 1,4 120V/60Hz Form Factor 0.
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AN400 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 Lutron RRD-10ND Leading Edge Y Y 252 9 Lutron RRD-3LD Leading Edge Y Y 252 9 Lutron S-600 Leading Edge Y Y 252 9 Lutron SCL-153 Leading Edge Y Y 251 9 Lutron TTCL-100 Leading Edge Y Y 252 9 1. 2. 3. 4. 5.
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AN400 7. PERFORMANCE PLOTS 0.26 0.25 Output Current (A) 0.24 0.23 0.22 0.21 0.2 108 110 112 114 116 118 120 122 124 126 128 130 132 Line Voltage (V) Figure 8. Output Current vs. Line Voltage 100 95 Efficiency (%) 90 85 80 75 108 110 112 114 116 118 120 122 Line Voltage (V) 124 126 128 130 132 Figure 9. Typical Efficiency vs.
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AN400 1 0.98 0.96 Power Factor 0.94 0.92 0.9 0.88 0.86 0.84 0.82 0.8 108 110 112 114 116 118 120 122 124 126 128 130 132 Link Voltage (V) Figure 10. Power Factor vs.
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AN400 8.