Cirrus Logic AN374 - Manual

Copyright  Cirrus Logic, Inc. 2013
(All Rights Reserved)
Cirrus Logic, Inc.
http://www.cirrus.com
Application Note
Considerations for Light Engine Selection
for a CS1630/31 2-Channel TRIAC Dimmable Circuit
1 Overview of the CS1630
The CS1630/31 is a high-performance offline AC to DC LED controller for dimmable and high color rendering index
(CRI) LED replacement lamps and luminaires. It features Cirrus Logic's proprietary digital dimmer compatibility con-
trol technology and digital correlated color temperature (CCT) control system that enables two-channel LED color
mixing.
The CS1630/31 offers tremendous flexibility to achieve constant CCT control to match an incandescent dimming
profile. The digital CCT control system provides the ability to program dimming profiles, such as constant CCT dim-
ming and black body line dimming. The CS1630/31 optimizes LED color mixing by temperature compensating the
LED current with an external negative temperature coefficient (NTC) thermistor. The IC controller is 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.
During the course of two-channel design, several design tradeoffs are made based on cost, size, and performance.
This document considers the requirements when designing a system around the CS1630/31. This document helps
answer the following system questions:
• How can the light engine be designed or modified to maximize the benefits of the CS1630/31?
• How can clear specifications be derived for the system and the LED driver that can reduce the light bulb
development time with the CS1630/31?
Further Reading
• See data sheet DS954 2-Channel TRIAC Dimmable LED Driver IC to review the features and
specifications of the CS1630/31
• See application note AN368 Design Guide for a CS1630/31 2-Channel TRIAC Dimmable SSL Circuit for
questions on how to design the LED driver using the CS1630/31
• See application note AN369 Device Programmer User Guide to review the CS1630/31 application software
and graphical user interface (GUI)
AN374
FEB’13
AN374REV2