Cirrus Logic AN402 User Manual

CRD1615A-8W-125V Schematic

AN402

Design Example of CS1615A

for 8.5W Dimmer-Compatible SSL Circuit

Features

• Supports Cirrus Logic CS1615A

• Quasi-resonant Buck-Boost Topology with Constantcurrent Output

• Flicker-free Dimming

• Line Voltage: 108VAC -132VAC

• Rated Input Power: 8.5W

• Rated Output Power: 7.83W

• Efficiency: ~88% at 58mA for 42xLEDs 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 CS1615A, the CRD1615A-8W-125V. The CRD1615A-8W-125V reference design demonstrates the performance of the CS1615A resonant mode AC/DC LED driver IC with a 58mA output driving 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).

42xLEDs in series

. It

Cirrus Logic, Inc.

http://www.cirrus.com

AUG‘14

AN402

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.

AN402

1. INTRODUCTION

The CS1615A is a 120VAC quasi-resonant buck-boost mode dimmable LED controller IC. The CS1615A uses a digital control algorithm that is optimized for high efficiency and > 0.90 power factor over an input voltage range (108VAC -132VAC). The CS1615A integrates a dimmer compatibilty circuit with a constant output current, quasiresonant 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 CRD1615A-8W-125V 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 CS1615A data sheet.

The CRD1615A-8W-125V board demonstrates the performance of the CS1615A. This reference board has been designed for an output load of 42xLEDs in series at 58mA (

This data sheet provides the schematic and PCB layout for the reference design board. The performance graphs demonstrate the performance of the CS1615A dimmable-controller reference design in terms of Efficiency vs. Line Voltage, Power Factor vs. Line Voltage, THD vs. Line Voltage, Output Current vs. Line Voltage, and Output Current vs. Dim Angle.

125V typical).

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

2. SCHEMATIC

Figure 1. Schematic

AN402

Table 1: Bill of Materials

3. BILL OF MATERIALS

Ref Descript Part # 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 ECQ-E2683KB Panasonic C3 CAP FILM 0.15UF 250VDC RADIAL B32529C3154K289 EPCOS Inc C4 CAP CER 1UF 25V 10% X7R 0805 C2012X7R1E105K125AB TDK Corporation C5 CAP CER 0.047UF 25V 10% X7R 0603 C1608X7R1E473K TDK Corporation C6 CAP CER 1000PF 50V 10% X7R 0603 VJ0603Y102KXAAC31 Vishay Vitramon C7 CAP ALUM 33UF 35V 20% RADIAL ECA-1VHG330 Panasonic Electronic Components C8 CAP ALUM 33UF 160V 20% RADIAL UCY2C330MPD1TD Nichicon

C12 CAP CER 100PF 50V 10% X7R 0603 VJ0603Y101KXACW1BC Vishay Vitramon

D1, D2, D4, D8 DIODE SWITCH 75V 300MA SOD323 1N4148WX-TP MICRO COMMERCIAL

D6 DIODE ULTRA FAST 400V 1A SMA US1G-13-F Diodes Inc D7 DIODE FAST REC 600V 1A DO204AL 1N4937-E3/54 Vishay Semiconductor F1 RES 10 OHM 1W 5% AXIAL FRM1WJT-52-10R Yageo L1 10mH RL-5480-3-10000 Renco

NTC THERM 100K OHM ±5% 0.10mA NPb 0603 NCP18WF104J03RB MURATA

Q1 MOSFET N-CH 600V 2.5A TO252 AOD3N60 Alpha & Omega Semiconductor Inc Q2 MOSFET N-CH 30V 5.8A SOT-23 DMN3404L-7 Diodes Inc Q3 MOSFET N-CH SGL 60V 360mA SOT-23 2N7002P,215 NXP R1 RES 22 OHM 1/10W 1% 0603 SMD ERJ-3EKF22R0V Panasonic Electronic Components

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

R5 RES 470 OHM 2W 5% METAL FILM AX FMP200JR-52-470R Yageo R6 RES 47 OHM 1/10W ±1% NPb 0603 ERJ3EKF47R0V PANASONIC R8 RES 40.2K OHM 1/10W 1% 0603 SMD ERJ-3EKF4022V Panasonic Electronic Components

R9 RES 51K OHM 1/10W 1% 0603 SMD ERJ-3EKF5102V Panasonic Electronic Components R10 RES 14k OHM 1/10W ±1% NPB 0603 FILM CRCW060314K0FKEA DALE R12 RES 2.94 OHM 1/8W 1% 0805 SMD CRCW08052R94FKEA Vishay Dale R13 RES 10 OHM 1/10W 1% 0603 SMD ERJ-3EKF10R0V Panas onic Electronic Components R14 RES 69.8k OHM 1/10W ±1% NPb 0603 CRCW060369K8FKEA DALE R15 RES 2.61K OHM 1/10W 1% 0603 SMD ERJ-3EKF2611V Panasonic Electronic Components R16 RES 560K OHM 1/4W 5% 1206 SMD ERJ-8GEYJ564V Panasonic Electronic Components TR1 EE10/10 2.5mH KEE

U1 CS1615A Cirrus Logic

VZ VARISTOR 240V 7MM RADIAL MOV-07D241K Bourns Inc

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