Cirrus Logic AN368 User Manual
An368
Copyright
Cirrus Logic, Inc. 2012
(All Rights Reserved)
Cirrus Logic, Inc.
Application Note
Design Guide for a CS1630/31 2-Channel
TRIAC Dimmable SSL Circuit
1 Overview of the CS1630
The CS1630 is a high-performance offline AC /DC LED driver for dimmable and high color rendering index (CRI)
LED replacement lamps and luminaires. It features Cirrus Logic’s proprietary digital dimmer compatibility control
technology and digital correlated color temperature (CCT) control system that enables two-channel LED color mix-
ing. The CS1630 is designed for 120VAC line voltage applications.
The CS1630 integrates a critical conduction mode boost converter, providing power factor correction and superior
dimmer compatibility with a primary-side regulated quasi-resonant second stage, which is configurable for isolated
and non-isolated topologies. The digital CCT control system provides the ability to program dimming profiles, such
as constant CCT dimming and black body line dimming. The CS1630 optimizes LED color mixing by temperature
compensating LED current with an external NTC. The IC controller is also equipped with power line calibration for
remote system calibration and end-of-line programming. The CS1630 provides a register lockout feature for security
against potential access to proprietary registers.
1.1 Features
• Best-in-class Dimmer Compatibility
- Leading-edge (TRIAC) Dimmers, Trailing-edge Dimmers, and Digital Dimmers
• Correlated Color Temperature (CCT) Control System
• Up to 85% Efficiency
• Flicker-free Dimming
• Programmable Dimming Profile
- Constant CCT Dimming and Black Body Line Dimming
• <2% Minimum Dimming Level
• Temperature Compensated LED Current
• End-of-line Programming Using Power Line Calibration
- Lower LED Binning Requirement
• Programmable Series or Parallel 2-Channel Output
- Interleaved Output Eliminates Additional Transformer
• Programmable Quasi-resonant Second Stage with Constant-current Output
- Flyback, Buck, and Tapped Buck
• Register Lockout
• 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 and Current-sense Resistor Open/Short
- External Overtemperature Using NTC
AN368
DEC’12
AN368REV2