Cirrus Logic AN375 User Manual
An375
Copyright
Cirrus Logic, Inc. 2013
(All Rights Reserved)
Cirrus Logic, Inc.
Application Note
Design Guide for a CS1615 and CS1616 Single Stage
Dimmable Offline AC/DC Controller for LED Lamps
1 Overview of the CS1615/16
The CS1615 and CS1616 are high-performance single-stage dimmable offline AC/DC controllers. The CS1615/16 is a
cost-effective solution that provides unmatched single lamp and parallel lamp dimmer-compatibility performance for
dimmable LED applications. The CS1615 is designed for 120VAC line voltage applications, and the CS1616 is designed
for 230VAC line voltage applications.
The CS1615/16 features Cirrus Logic's proprietary adaptive dimmer-compatibility algorithm that enables flicker-free
operation from 0% to 100% output current with leading-edge dimmers, trailing-edge dimmers, and digital dimmers
(dimmers with an integrated power supply). In addition, the CS1615/16 is configurable for isolated and non-isolated
topologies.
1.1 Features
• 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
• 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
• Frequency Dithering
• IEC61000-3-2 Compliant
• Protection Features
- Output Open Circuit
- Output Short Circuit
- External Overtemperature Using NTC
AN375
JUL’13
AN375REV4