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Preliminary Product Information

This document contains information for a product under development.

Cirrus Logic reserves the right to modify this product without notice.

Cirrus Logic, Inc.

http://www.cirrus.com

CS1615A

CS1616A

Single Stage Dimmable Controller for LED Lamps

Features

• Reduced Off-chip BOM Compared to CS1615/16

• Best-in-class Dimmer Compatibility

- Leading-edge (TRIAC) Dimmers

- Trailing-edge Dimmers

- Digital Dimmers (Dimmers with an Integrated Power

Supply)

• Flicker-free Dimming

• 0% to 100% Smooth Dimming

• Optimized for Output Power <11W

• Primary-side Regulation (PSR)

• Active Power Factor Correction (PFC)

- >0.9 Power Factor

• Constant-current Output

- Flyback

- Buck-boost

• Tight LED Current Regulation: Better than ±5%

• Low THD: Less Than 20%

• Up to 90% Efficiency

• Fast Startup

• Meets NEMA SSL 6 Dimming Standard

- Closely Matches Incandescent S-curve

• Protection Features

- Output Open Circuit

- Output Short Circuit

- Overtemperature

Overview

The CS1615A and CS1616A are high-performance single

stage dimmable offline AC/DC controllers. The

CS1615A/16A requires fewer off-chip components than

the CS1615/16 resulting in a lower total BOM cost. The

CS1615A/16A provides unmatched single- and multi-lamp

dimmer-compatibility performance for dimmable LED

applications. The CS1615A is designed for 120VAC line

voltage applications, and the CS1616A is designed for

230VAC line voltage applications.

Across a broad range of dimmers, the CS1615A/16A

provides smooth flicker free dimming, and consistently

dims to nearly zero light output, which closely matches the

dimming performance of incandescent light bulbs. Cirrus

Logic’s patent pending approach to dimmer compatibility

provides full functionality on a wide range of dimmers,

including leading-edge, trailing-edge, and digital dimmers.

Applications

• Retro-fit LED Lamps

• External LED Drivers

• LED Luminaires

• Commercial Lighting

Ordering Information

See page 14.

Mains

BR1

BR 1

CS1615A/16A

FBAUX

GND

IAC

VDD

SOURCE

eOTP

NTC

FBSENSE

SGND

CTRL1 CTRL2

CTRL1

CTRL2

C1 C2

rect

AUX

R3 R4

Sense

LED+

LED -

AUX

AUG’13

DS1033PP2

Summary of content (16 pages)

PAGE 1
CS1615A CS1616A Single Stage Dimmable Controller for LED Lamps Features Overview • Reduced Off-chip BOM Compared to CS1615/16 • Best-in-class Dimmer Compatibility - Leading-edge (TRIAC) Dimmers - Trailing-edge Dimmers - Digital Dimmers (Dimmers with an Integrated Power Supply) • Flicker-free Dimming • 0% to 100% Smooth Dimming • Optimized for Output Power <11W • Primary-side Regulation (PSR) • Active Power Factor Correction (PFC) - >0.
PAGE 2
CS1615A/16A 1. INTRODUCTION VDD VDD Voltage Regulator 14 VDD(on) VDD(off ) VZ I ref 15k 2 OLP - + VS OURCE(th) Peak Control + - + - - t VAUX CTRL1 eOTP CTRL2 11 FBSENSE 16 FBAUX 3 CLAMP VOCP (th) VP k_Max (th ) DAC SGND GND VOLP (th ) + ADC - 5 12 3 OCP SOURCE GD - Blank IAC 13 POR + + V FS TA RT(th ) 4 Output Overvoltage 8 Zero-current Detect ICONNE CT 10 9 + - VOV P(th ) VDD MUX + - VZCD(th) VDD V CONNE CT(th) - I CLA MP + Figure 1.
PAGE 3
CS1615A/16A 2. PIN DESCRIPTION NC 1 16 FBAUX Zero-current Detect Rectifier Voltage Sense IAC 2 15 NC No Connect Voltage Clamp Current Source CLAMP 3 14 VDD IC Supply Voltage Source Ground SGND 4 13 GD Gate Drive Source Switch SOURCE 5 12 GND Ground No Connect NC 6 11 FBSENSE Flyback Current Sense No Connect NC 7 10 eOTP External Overtemperature Protection Dimmer Hold Current CTRL1 8 9 CTRL2 LED Load Current No Connect 16-lead SOIC and TSSOP Figure 2.
PAGE 4
CS1615A/16A 3. CHARACTERISTICS AND SPECIFICATIONS 3.1 Electrical Characteristics Typical characteristics conditions: • TA = 25 °C, VDD = 12V, GND = 0 V • All voltages are measured with respect to GND. • Unless otherwise specified, all currents are positive when flowing into the IC.
PAGE 5
CS1615A/16A Parameter Condition Symbol Min Typ Max Unit Flyback/Buck-boost Protections Overcurrent Protection (OCP) (Note 4) VOCP(th) - 1.69 - V Overvoltage Protection (OVP) (Note 5) VOVP(th) - 1.
PAGE 6
CS1615A/16A 3.2 Thermal Resistance Symbol Parameter SOIC TSSOP Unit JA Junction-to-Ambient Thermal Impedance 2 Layer PCB 4 Layer PCB 119 105 138 103 °C/W °C/W JC Junction-to-Case Thermal Impedance 2 Layer PCB 4 Layer PCB 50 44 44 28 °C/W °C/W 3.3 Absolute Maximum Ratings Characteristics conditions: All voltages are measured with respect to GND. Pin Symbol 14 VDD Parameter IC Supply Voltage Value Unit 18.5 V 1,2,8,9, 10,11,16 Analog Input Maximum Voltage -0.5 to (VDD +0.
PAGE 7
CS1615A/16A 4. TYPICAL PERFORMANCE PLOTS 8 3 2 IDD (mA) UVLO Hysteresis 6 4 Falling Edge 2 Rising Edge 1 0 -2 0 -50 0 50 100 0 150 2 4 6 8 Temperature (ºC) 12 14 16 18 20 VDD (V) Figure 3. UVLO Characteristics Figure 4. Supply Current vs. Voltage 10 20 19.5 9 Turn On Vz (V) VDD (V) 10 19 8 Turn Off 18.5 7 -50 0 50 100 18 150 -45 Temperature (ºC) -20 5 25 55 85 105 125 Temperature (ºC) Figure 6. Zener Voltage vs. Temperature Figure 5.
PAGE 8
CS1615A/16A 5. GENERAL DESCRIPTION 5.1 Overview The CS1615A and CS1616A are high-performance single stage dimmable offline AC/DC controllers. The CS1615A/16A is a cost-effective solution that provides unmatched single- and multi-lamp dimmer-compatibility performance for dimmable LED applications. The CS1615A is designed for 120VAC line voltage applications, and the CS1616A is designed for 230VAC line voltage applications.
PAGE 9
CS1615A/16A dimmer switch on the falling edge of the input voltage using a source-controlled dimmer-compatibility circuit. 5.4.1 Clamp Overpower Protection The CS1615A/16A clamp overpower protection (COP) control logic averages the turn-on time of the clamp circuit. If the output of the averaging logic exceeds 10%, a COP event is actuated. The clamp circuit is disabled as well as the flyback/buck-boost controller and the dimmer-compatibility circuit.
PAGE 10
CS1615A/16A Figure 14 illustrates the dual-mode buck-boost topology. The CS1615A/16A regulates the output current by controlling the peak current to ensure that the target output charge is achieved every half line-cycle. Demagnetization time of the inductor is sensed by the FBAUX pin using an auxiliary winding and is used as an input to the control loop.
PAGE 11
CS1615A/16A Overcurrent Protection Overcurrent protection (OCP) is implemented by monitoring the voltage across the sense resistor. If this voltage exceeds a threshold VOCP(th) of 1.69V, a fault condition occurs. The IC output is disabled and the controller attempts to restart after approximately one second. 5.6.8 Open Loop Protection Open loop protection (OLP) and sense resistor short protection are implemented by monitoring the voltage across the resistor.
PAGE 12
CS1615A/16A 6. PACKAGE DRAWING 16-PIN TSSOP (173 MIL BODY) F # & & ("6(& 1-"/& T 1*/ */%*$"503 - %&5"*- " Y 5JQT EEE $ # " 501 7*&8 %&5"*- " % " " D 4&"5*/( 1-"/& C " Y Y $ CCC BBB $ $# " &/% 7*&8 4*%& 7*&8 mm Dimension MIN NOM MAX MIN NOM MAX A -- -- 1.20 -- -- 0.047 A1 0.05 -- 0.15 0.002 -- 0.006 b 0.19 -- 0.30 0.007 -- 0.012 C 0.09 -- 0.20 0.004 -- 0.008 D 4.90 5.00 5.10 0.193 0.197 0.201 E E1 6.40 BSC 4.30 e 1.
PAGE 13
CS1615A/16A 16-PIN SOICN (150 MIL BODY) mm inch Dimension MIN NOM MAX MIN NOM MAX A -- -- 1.75 -- -- 0.069 A1 0.10 -- 0.25 0.004 -- 0.010 b 0.31 -- 0.51 0.012 -- 0.020 c 0.10 -- 0.25 0.004 -- 0.010 D 9.90 BSC 0.390 BSC E 6.00 BSC 0.236 BSC E1 3.90 BSC 0.154 BSC e 1.27 BSC 0.050 BSC L 0.40 -- 1.27 0.016 -- 0.050 Θ 0° -- 8° 0° -- 8° aaa 0.10 0.004 bbb 0.25 0.010 ddd 0.25 0.010 Notes: 1. Controlling dimensions are in millimeters. 2. 3.
PAGE 14
CS1615A/16A 7.
PAGE 15
CS1615A/16A REVISION HISTORY Revision Date PP1 JUL 2013 Edited content to move source switcher PP2 AUG 2013 Context clarification DS1033PP2 Changes 15
PAGE 16
CS1615A/16A 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 "Preliminary” product information describes products that are in production, but for which full characterization data is not yet available. Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable.