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Cirrus Logic, Inc.

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CS1610A/11A

CS1612A/13A

TRIAC Dimmable LED Driver IC

Features & Description

• Best-in-class Dimmer Compatibility

- Leading-edge (TRIAC) Dimmers

- Trailing-edge Dimmers

- Center-cut Dimmers

- Digital Dimmers (with Integrated Power Supply)

• Up to 90% Efficiency

• Optimized for 25W Input Power

• Flicker-free Dimming

• 0% Minimum Dimming Level

• Quasi-resonant Second Stage with Constant-current Output

- Flyback and Buck

• Fast Startup

• Tight LED Current Regulation: Better than ±5%

• Primary-side Regulation (PSR)

• >0.9 Power Factor

• IEC-61000-3-2 Compliant

• NEMA SSL6 Compatible

•Soft Start

• Protections:

- Output Open/Short

- Current-sense Resistor Open/Short

- External Overtemperature Using NTC

Overview

The CS1610A/1A/12A/13A is a digital control IC engineered to

deliver a high-efficiency, cost-effective, flicker-free, phase-

dimmable, solid-state lighting (SSL) solution for the incandescent

lamp-replacement market. The CS1610A/11A is designed to

control a quasi-resonant flyback topology. The CS1612A/13A is

designed to control a buck topology. The CS1610A/12A and

CS1611A/13A are designed for 120VAC and 230VAC line

voltage applications, respectively.

The CS1610A/11A/12A/13A integrates a critical conduction

mode (CRM) boost converter that provides power factor

correction and dimmer compatibility with a constant output

current, quasi-resonant second stage. An adaptive dimmer

compatibility algorithm controls the boost stage and dimmer

compatibility operation mode to enable flicker-free operation to

<2% output current with leading-edge, trailing-edge, center-cut,

and digital dimmers (dimmers with an integrated power supply).

Applications

• Dimmable Retrofit LED Lamps

• Dimmable LED Luminaries

• Offline LED Drivers

• Commercial Lighting

Ordering Information

See page 16.

LED+

LED-

R12

NTC

Z2C8

R11

R13

FB GA IN

CS1610A/11A

IAC

SOURCE

FBGAIN

FBAUX

BSTOUT

GNDSGND

IPK

CLAMP

FBSENSE

eOTP

BSTAUX

VDD

R10

NTC

IP K

BR1 BR1

Mains

BR1 BR1

Z1 C4

rect

BST

JUN’14

DS976F1

Summary of content (18 pages)

PAGE 1
CS1610A/11A CS1612A/13A TRIAC Dimmable LED Driver IC Features & Description Overview • Best-in-class Dimmer Compatibility - Leading-edge (TRIAC) Dimmers - Trailing-edge Dimmers - Center-cut Dimmers - Digital Dimmers (with Integrated Power Supply) • Up to 90% Efficiency • Optimized for 25W Input Power • Flicker-free Dimming • 0% Minimum Dimming Level • Quasi-resonant Second Stage with Constant-current Output - Flyback and Buck • Fast Startup • Tight LED Current Regulation: Better than ±5% • Primary-side R
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CS1610A/11A CS1612A/13A 1.
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CS1610A/11A CS1612A/13A 2.
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CS1610A/11A CS1612A/13A 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. Parameter Minimum/Maximum characteristics conditions: • TJ = -40°C to +125 °C, VDD = 11V to 17V, GND = 0 V Condition Symbol Min Typ Max Unit After Turn-on VDD 11 - 17 V VDD Increasing VST(th) - 9.
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CS1610A/11A CS1612A/13A Parameter Condition Symbol Min Typ Max Unit VFBZCD(th) - 200 - mV tFBZCB - 2 2.8 - s s IZCD -2 - - mA - VDD +0.6 - V Minimum On Time - 0.55 - s Maximum On Time CS1610A/11A/13A CS1612A - 8.8 12.0 - s s tFB(Min) - 625 - Hz tFB(Max) - 200 - kHz Output Source Resistance ZOUT - 20.3 -  Output Sink Resistance ZOUT - 9.
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CS1610A/11A CS1612A/13A 3.2 Thermal Resistance Symbol Parameter Value Unit JA Junction-to-Ambient Thermal Impedance 2 Layer PCB 4 Layer PCB 135 129 °C/W °C/W JC Junction-to-Case Thermal Impedance 2 Layer PCB 4 Layer PCB 50 43 °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, 5, 8, 9, 10,11,15,16 Analog Input Maximum Voltage -0.5 to (VDD +0.
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CS1610A/11A CS1612A/13A 4. TYPICAL PERFORMANCE PLOTS 8 3 2 IDD (mA) UVLO Hysteresis 6 1 4 Rising Edge Falling Edge 2 0 -2 0 -50 0 50 100 0 150 2 4 6 10 12 14 16 18 20 Figure 4. Supply Current vs. Voltage Figure 3. UVLO Characteristics 20 10 19.5 Turn On VDD (V) VZ (V) 9 8 Turn Off 19 18.5 18 7 -50 0 50 100 -50 150 0 50 100 150 Temperature (ºC) Temperature (ºC) Figure 6. Zener Voltage vs. Temperature Figure 5. Turn On/Off Threshold Voltage vs. Temperature 0.
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CS1610A/11A CS1612A/13A 5. GENERAL DESCRIPTION 5.1 Overview The CS1610A/11A/12A/13A is a digital control IC engineered to deliver a high-efficiency, cost-effective, flicker-free, phasedimmable, solid-state lighting (SSL) solution for the incandescent lamp-replacement market. The CS1610A/11A/12A/13A has best-in-class dimmer compatibility and mixed-load compatibility because it is enhanced with a center-cut algorithm and a mixedload compatibility algorithm.
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CS1610A/11A CS1612A/13A 5.3.4 Leading-edge Mode In Leading-edge Mode, the CS1610A/11A/12A/13A regulates boost output voltage VBST while maintaining the dimmer phase angle (see Figure 9). The device executes a CCM boost algorithm using dimmer attach current as the initial peak current on the initial firing event of the dimmer. After gaining control of the incoming current, the device transitions to a CRM boost algorithm to regulate the boost output voltage.
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CS1610A/11A CS1612A/13A 5.4.1 Maximum Peak Current The maximum boost inductor peak current is set using external resistor R IPK on pin IPK, which is sampled periodically by an ADC. Maximum power output is proportional to peak current code I PK(code). See Equation 1:   I PK  BST   Vrms  typ   P IN  max  = ------------------------------------------------------------2 By using digital loop compensation, the voltage feedback signal does not require an external compensation network.
PAGE 11
CS1610A/11A CS1612A/13A 5.5 Voltage Clamp Circuit To keep dimmers conducting and prevent them from misfiring, a minimum power needs to be delivered from the dimmer to the load. This power is nominally around 2W for 230V and 120V TRIAC dimmers. At low dim angles (90°), this excess power cannot be converted into light by the second output stage due to the dim mapping at light loads. Boost stage output voltage VBST can rise above the safe operating voltage of the primary-side bulk capacitor C8.
PAGE 12
CS1610A/11A CS1612A/13A A quasi-resonant buck stage is illustrated in Figure 16. The buck stage is controlled by measuring current in the buck inductor and voltage on the auxiliary winding. VB S T The FBGain input is set using resistor RFBGAIN . Resistor RFBGAIN must be selected to ensure that the switching period TT is greater than the resonant switching period Tcritical at maximum output power. See Equation 5: LED + TT   T critical = T1 + T2  [Eq.
PAGE 13
CS1610A/11A CS1612A/13A 5.7.4 Overcurrent Protection Overcurrent protection (OCP) is implemented by monitoring the voltage across the second stage sense resistor. If this voltage exceeds OCP threshold VOCP(th) of 1.69V, a fault condition occurs. The IC output is disabled, and the controller attempts to restart after one second. 5.7.
PAGE 14
CS1610A/11A CS1612A/13A For external overtemperature protection, a second low-pass filter with a time constant of two minutes filters the ADC output and uses it to scale down the internal dim level of the system (and hence LED current ILED) if the temperature exceeds 95 °C (see Figure 18). The large time constant for this filter ensures that the dim scaling does not happen spontaneously and is not noticeable (suppress spurious glitches).
PAGE 15
CS1610A/11A CS1612A/13A 6. PACKAGE DRAWING 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.
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CS1610A/11A CS1612A/13A 7.
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CS1610A/11A CS1612A/13A 9. REVISION HISTORY Revision Date PP1 JAN 2012 Initial release. PP2 APR 2012 Removed ambient temperature range specification, increased power dissipation specification. Corrected typographical errors. PP3 MAR 2013 Added Center-cut Mode and context corrections.
PAGE 18
CS1610A/11A CS1612A/13A Contacting Cirrus Logic Support For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one nearest you go to http://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).