Cirrus Logic AN401 User Manual

CRD1615-25W-33V Schematic

AN401

Design Example of CS1615

for 25W Dimmer-Compatible SSL Circuit

Features

• Supports Cirrus Logic CS1615

• Quasi-resonant Flyback Topology with Constant­current Output

• Flicker-free Dimming

• Line Voltage: 108VAC -132VAC

• Rated Input Power: 25W

• Rated Output Power: 20.5W

• Efficiency: ~83% at 575mA for 11xLEDs 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 CRD1615-25W-33V. The CRD1615­25W-33V reference design demonstrates the performance
of the CS1615 resonant mode AC/DC LED driver IC with a
575mA 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).

11xLEDs in series

. It offers best-in-

Cirrus Logic, Inc.

http://www.cirrus.com

Copyright  Cirrus Logic, Inc. 2014

(All Rights Reserved)

AUG‘14

AN401

AN401

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.

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AN401

1. INTRODUCTION

The CS1615 is a 120VAC quasi-resonant flyback 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 CRD1615-25W-33V 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 CRD1615-25W-33V board demonstrates the performance of the CS1615. This reference board has been de­signed for an output load of 11xLEDs in series at 575mA (

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.

33V typical).

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2. SCHEMATIC

Figure 1. Schematic

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3. BILL OF MATERIALS

Table 1: Bill of Materials

Part Descr iption Part Num ber Manufactu rer

C1 CAP FILM 0.12UF 250VDC RADIAL ECQ-E2124KB Panasonic Electronic Components
C2 CAP FILM 0.047UF 250VDC RADIAL B32529C3473K EPCOS Inc
C3 CAP FILM 0.1UF 250VDC RADIAL R82I C3100DQ60J Kemet
C4 CAP CER 1000PF 1KV 10% X7R 0805 102R15W102KV4E Johanson Dielectrics Inc
C5 CAP CER 0.047UF 25V 10% X7R 0603 C1608X7R1E473K TDK Corporation
C6 CAP CER 2.2UF 35V 10% X5R 0603 C1608X5R1V225K080AC TDK Corporation
C7 CAP CER 56PF 1KV 5% NP0 1206 C1206C560JDGACTU Kemet
C8 CAP ALUM 2200UF 50V 20% RADIAL ECA-1HHG222 Panasonic Electronic Components
C9 CAP CER 56PF 50V 5% NP0 0603 C1608C0G1H560J080AA TDK Corporation

C10 CAP CER 56PF 50V 5% NP0 0603 C1608C0G1H560J080AA TDK Corporation

D1 DIODE SCHOTTKY 30V 350MA SOD323 SD103BWS-TP Micro Commercial
D2 DI ODE STD REC 1A 600V DO214AC GS1J-TP Micro Commercial Co
D3 RECTIFIER 1A 600V DO-41 1N4005-TP Micro Commercial
D5 DI ODE SCHOTTKY 150V 3A SMB STPS3150U STMicroelectronics
D7 DIODE FAST 600V 1A SMA STTH1R06A STMicroelectronics
D8 DIODE SWITCH 100V 150MA SOD123 1N4148W-TP Micro Commercial

DB1 RECT BRIDGE GPP 600V 0.8A MBS B6S-G Comchip

L1 Renco 10mH inductor RL-5480-4-10000 Renco

NTC THERMISTOR 100K OHM NTC 0603 SMD NCP18WF104J03RB Murata

Q1 MOSFET N-CH 600V 1.3A DPAK AOD1N60 Alpha & Omega
Q3 MOSFET N-CH 600V 2.8A DPAK FQD5N60CTM Fairchild Semiconductor
Q4 MOSFET N-CH SGL 60V SOT-23 2N7002P,215 NXP

VR1 VARISTOR 175V 1200A 7MM STRAIGHT V07E175P Littelfus e Inc

R1 RES FUSIBLE WW 8.2 OHM 1W 5% FKN1WSJR-52-8R2 Yageo
R2 RES 100K OHM .5W 5% 1206 SMD CRCW1206100KJNEAHP Vishay Dale
R3 RES 82 OHM 2W 5% METAL FILM AX FMP200JR-52-82R Yageo
R6 RES 3.3K OHM 2W 5% METAL OXIDE ERG-2SJ332A Panasonic Electronic Components
R7 RES 750K OHM 1/4W 1% 1206 SMD RC1206FR-07750KL Yageo

R8 RES 750K OHM 1/4W 1% 1206 SMD RC1206FR-07750KL Yageo
R10 RES 330 OHM 2W 5% METAL FILM AX FMP200JR-52-330R Yageo
R11 RES 45.3K OHM 1/10W 1% 0603 SMD ERJ-3EKF4532V Panasonic Electronic Components
R12 RES 45.3K OHM 1/10W 1% 0603 SMD ERJ-3EKF4532V Panasonic Electronic Components
R13 RES 15.0K OHM 1/10W 1% 0603 SMD RC0603FR-0715KL Yageo

R14, R15 RES 1.80 OHM 1/4W 1% 1206 SMD CRCW12061R80FKEA Vishay Dale

R16 RES 47.0 OHM 1/10W 1% 0603 SMD RC0603FR-0747RL Yageo
R17 RES 69.8K OHM 1/10W 1% 0603 SMD RC0603FR-0769K8L Yageo
R18 RES 2.00K OHM 1/10W 1% 0603 SMD ERJ-3EKF2001V Panasonic Electronic Components
R19 RES 30.0K OHM 1/4W 1% 1206 SMD ERJ-8ENF3002V Panasonic Electronic Components
R22 RES 47.0 OHM 1/10W 1% 0603 SMD RC0603FR-0747RL Yageo
TR1 EE-20 Cirrus

U1 CS1615-PAD Cirrus

Z1 D IODE ZENER 500MW 16V SOD123 NZH16C,115 NXP Semiconductors

Z2 RES 100K OHM .5W 5% 1206 SMD CRCW1206100KJNEAHP Vishay Dale

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