Cirrus Logic AN400 User Manual

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 Constantcurrent 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 CRD161511W-36V reference design demonstrates the performance of the CS1615 resonant mode AC/DC LED driver IC with a 250mA output driving 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).

12xLEDs in series

. It offers best-in-

Cirrus Logic, Inc.

http://www.cirrus.com

AUG‘14

AN400

Contacting Cirrus Logic Support

For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find the one nearest to you go to www.cirrus.com

IMPORTANT NOTICE

Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.

Cirrus Logic, Cirrus, the Cirrus Logic logo designs, EXL Core, and the EXL Core logo design are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners.

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.

Risk of Electric Shock

• The direct connection to the AC power line and the open and unprotected boards present a serious risk of electric shock and can cause serious injury or death. Extreme caution needs to be exercised while handling this board.

• Avoid contact with the exposed conductor or terminals of components on the board. High voltage is present on exposed conductor and it may be present on terminals of any components directly or indirectly connected to the AC line.

• Dangerous voltages and/or currents may be internally generated and accessible at various points across the board.

• Charged capacitors store high voltage, even after the circuit has been disconnected from the AC line.

• Make sure that the power source is off before wiring any connection. Make sure that all connectors are well

connected before the power source is on.

• Follow all laboratory safety procedures established by your employer and relevant safety regulations and guidelines, such as the ones listed under, OSHA General Industry Regulations - Subpart S and NFPA 70E.

Suitable eye protection must be worn when working with or around demonstration boards. Always

comply with your employer’s policies regarding the use of personal protective equipment.

All components and metallic parts may be extremely hot to touch when electrically active.

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. An adaptive dimmer compatibility algorithm controls the dimmer compatibility operation mode to enable flicker-free operation from 0% to 100% output current with leading-edge, trailing-edge, and digital dimmers.

The CRD1615-11W-36V board is optimized to deliver low system cost in a high-efficiency, flicker-free, phasedimmable, solid-state lighting (SSL) solution for incandescent lamp replacement applications. The feedback loop is closed through an integrated digital control system within the IC. Protection algorithms such as output open/short, current-sense resistor open/ short, and overtemperature thermistors protect the system during abnormal conditions. Details of these features are provided in the CS1615 data sheet.

The CRD1615-11W-36V board demonstrates the performance of the CS1615. This reference board has been designed for an output load of 12xLEDs in series at 250mA (

This data sheet provides the schematic and PCB layout for the reference design board. The performance graphs demonstrate the performance of the CS1615 dimmable-controller reference design in terms of Efficiency vs. Line Voltage, Power Factor vs. Line Voltage, THD vs. Line Voltage, and Output Current vs. Line Voltage.

Extreme caution needs to be exercised while handling this board. This board is to be used by trained professionals only.

36V typical).

2. SCHEMATIC

Figure 1. Schematic

AN400

3. BILL OF MATERIALS

Table 1: Bill of Materials

Ref Description Manufacturer Part Number Manufacturer

BR1 DIODE RECT 200V 0.8A NPB MINIDIP HD02-T DIODES INC

C1 CAP FILM 0.047UF 250VDC RADIAL B32529C3473K EPCOS Inc C2 CAP FILM 0.068UF 250VDC RADIAL B32529C3683J EPCOS Inc C3 CAP FILM 0.15UF 250VDC RADIAL B32529C3154J289 EPCOS Inc C4 CAP CER 0.1UF 25V 10% X7R 0603 GRM188R71E104KA01D Murata Electronics North America C5 CAP CER 0.047UF 25V 10% X7R 0603 C1608X7R1E473K TDK Corporation C7 CAP ALUM 33UF 35V 20% RADIAL ECA-1VHG330 Panasonic Electronic Components C8 CAP ALUM 470UF 50V 20% RADIAL UHE1H471MHD6 Nichicon

C9, C10 CAP CER 56PF 50V 5% NPO 0603 CC0603JRNPO9BN560 Yageo

D1 DIODE SCHOTTKY 30V 350mA SOD323 SD103BWS-TP Micro Commerical D2 DI ODE SUPER FAST 600V 1A SMA ES1J-LTP Micro Commercial Co

D3, D4 DIODE SWITCH 75V 300MA SOD323 1N4148WX-TP MICRO COMMERCIAL

D6 DIODE SUPER BARRIER 150V 2A SMA SBR2U150SA-13 Diodes Inc D7 DIODE SWITCH 300V 0.225A SOD123 BAV3004W-7-F Diodes Inc

F1 RES 0.22 OHM 1/2W 5% AXIAL NFR25H0002207JR500 Vishay BC Components L1 10mH RL-5480-3-10000 Renco

HERM 100K OHM ±5% 0.10mA NPb 060

NTC

Q1 MOSFET N-CH 600V 2.5A IPAK AOU3N60 Alpha & Omega Semiconductor Inc Q2 MOSFET N-CH 500V 4.3A TO251 IPU50R950CE Infineon Technologies Q3 MOSFET N-CH SGL 60V 360mA SOT-23 2N7002P,215 NXP

R1 RES 3.3K OHM 1W 5% METAL FILM AX FMP100JR-52-3K3 Yageo

R2, R3 RES 750K OHM 1/8W 1% 0805 SMD RMCF0805FT750K Stackpole Electronics Inc

R4 RES 82 OHM 1/2W 5% CF MINI CFM12JT82R0 Stackpole Electronics Inc R5 RES 100 OHM 1W 5% AXIAL PR01000101000JR500 Vishay BC Components

R6, R13 RES 47 OHM 1/10W ±1% NPb 0603 ERJ3EKF47R0V PANASONIC

R8 RES 66.5K OHM 1/10W 1% 0603 SMD ERJ-3EKF6652V Panasonic Electronic Components R9 RES 51.1K OHM 1/10W 1% 0603 SMD ERJ-3EKF5112V Panasonic Electronic Components

ES 14k OHM 1/10W ±1% NPB 0603 FIL

R10 R12 RES 1.33 OHM 1/8W 1% 0805 SMD CRCW08051R33FKEA Vishay Dale R14 RES 69.8k OHM 1/10W ±1% NPb 0603 CRCW060369K8FKEA DALE R15 RES 2.94K OHM 1/10W 1% 0603 SMD ERJ-3EKF2941V Panasonic Electronic Components R16 RES 100K OHM 1/8W 5% 0805 SMD ERJ-6GEYJ104V Panasonic Electronic Components TR1 EE1010 KEE

U1 CS1615 Cirrus Logic

VZ VARISTOR 240V 1.2KA DISC 7MM S07K150 EPCOS Inc Z1 DI ODE ZENER 500MW 16V SOD123 NZH16C,115 NXP Semiconductors

AN400

NCP18WF104J03RB MURATA

CRCW060314K0FKEA DALE

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