Cirrus Logic AN401 User Manual
An401
Copyright
Cirrus Logic, Inc. 2014
(All Rights Reserved)
Cirrus Logic, Inc.
CRD1615-25W-33V Schematic
AN401
Design Example of CS1615
for 25W Dimmer-Compatible SSL Circuit
Features
• Supports Cirrus Logic CS1615
• Quasi-resonant Flyback Topology with Constant-
current Output
• Flicker-free Dimming
• Line Voltage: 108VAC -132VAC
• Rated Input Power: 25W
• Rated Output Power: 20.5W
• Efficiency: ~83% at 575mA for 11xLEDs in Series
• Low Component Count
General Description
This application note provides an example of a Solid State
Lighting (SSL) LED lamp circuit designed using Cirrus
Logic’s CS1615, the CRD1615-25W-33V. The CRD1615-
25W-33V reference design demonstrates the performance
of the CS1615 resonant mode AC/DC LED driver IC with a
575mA output driving 11xLEDs in series. It offers best-in-
class dimmer compatibility and minimum dimming
performance with leading-edge, trailing-edge, and digital
dimmers. The form factor is targeted to fit into many LED
bulb applications (A19-type, PAR).
AUG‘14
AN401