Cirrus CS161x8 WLED Driver Reference Design

LED decorative lights, dimmable LED lighting, offline LED drivers, and commercial lighting. This article introduces the main features, block diagram, typical application circuit, and typical flyback and buck circuit diagrams of the CS1610/11/12/13, as well as the main features and specifications of the CRD 1611-8W and CRD 1610-8W reference designs.

The CS1610/11/12/13 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 CS1610/11 is designed to control a quasi-resonant flyback topology. The CS1612/13 is designed to control a buck topology. The CS1610/12 and CS1611/13 are designed for 120VAC and 230VAC line voltage applications, respectively.

The CS1610/11/12/13 integrates a critical conduction mode (CRM) boost converter that provides power factor correction and dimmer compatibility with a constant output current, quasiresonant 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, and digital dimmers (dimmers with an integrated power supply).

CS1610/11/12/13主要特性:

• Best-in-Class Dimmer Compatibility

- Leading-edge (TRIAC) Dimmers

- Trailing-edge Dimmers

- Digital Dimmers (with Integrated Power Supply)

• Up to 90% Efficiency

• 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

• Soft Start

• Protections:

- Output Open/Short

- Current-sense Resistor Open/Short

- External Overtemperature Using NTC

CS1610/11/12/13 Applications:

• Dimmable Retrofit LED Lamps

• Dimmable LED Luminaries

• Offline LED Drivers

• Commercial Lighting

Figure 1. CS1610/11/12/13 Block Diagram

Figure 2. CS1610/11/12/13 Typical Application Circuit

Figure 3. CS1610/11 Typical Flyback Circuit

Figure 4. CS1612/13 Typical Buck Circuit

CRD 1611-8W Reference Design

The CRD 1611-8W reference design demonstrates the performance of the CS1611 resonant mode AC/ DC dimmable LED driver IC with a 550 mA output driving 4 LEDs in series. It offers best-in-class dimmer compatibility with leading edge, trailing edge, and digital dimmers. The form factor is targeted to fit into many LED bulb applications (A19, PAR).

CRD 1611-8W reference design key features:

ƒƒ Quasi-resonant flyback with constant current output

ƒƒ Flicker-free dimming

ƒƒ Line voltage 230 VAC, ±10%

ƒƒ Rated input power: 8 W

ƒƒ Rated output power: 6.6 W

ƒƒ Efficiency: 83% at 550 mA, for 4 X LEDs in series

ƒƒ Low component count

ƒƒ Supports Cirrus Logic product CS1611Figure

5.CRD 1611-8W reference design outline

The CRD 1610-8W reference design demonstrates the performance of the CS1610 resonant mode AC/DC dimmable LED driver IC with a 470 mA output driving 5 X LEDs in series. It offers best-in-class dimmer compatibility with leading edge, trailing edge and digital dimmers. The form factor is targeted to fit into many LED bulb applications (A19, PAR).

CRD 1610-8W Reference Design Key Features :

ƒƒ Quasi-resonant flyback with constant current output

ƒƒ Flicker-free dimming

ƒƒ Line voltage 120 VAC, ±10%

ƒƒ Rated input power: 8.1 W

ƒƒ Rated output power: 6.7 W

ƒƒ Efficiency: 84% at 470 mA, for 5 X LEDs in series

ƒƒ Low component count

ƒƒ Supports Cirrus Logic product CS1610

Figure 5. CRD 1610-8W reference design outline

CRD 1610-8W and CRD 1611-8W reference design key specifications:

For details, please visit:
http://www.cirrus. com/en/pubs/proDatasheet/CS1610-11-12-13_F3.pdf
and
http://www.cirrus.com/en/pubs/brochure/LED_Brochure.pdf