Cirrus Logic AN398 - Manual (Page 3)

AN398
3
1. INTRODUCTION
The CS1610 is a 120VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1610 uses a digital con-
trol algorithm that is optimized for high efficiency and > 0.90 power factor over an input voltage range (108VAC to
132VAC). The CS1610 integrates a critical conduction mode (CRM) boost converter that provides power factor cor-
rection and dimmer compatibility with a constant output current, quasi-resonant flyback stage. An adaptive dimmer
compatibility algorithm controls the boost stage and dimmer compatibility operation mode to enable flicker-free op-
eration from 0% to 100% output current with leading-edge, trailing-edge, and digital dimmers.
The CRD1610-15W-27V board is optimized to deliver low system cost in a high-efficiency, flicker-free, phase-
dimmable, solid-state lighting (SSL) solution for incandescent lamp replacement applications. The feedback loop is
closed through an integrated digital control system within the IC. Protection algorithms such as output open/short,
current-sense resistor open/short, and overtemperature thermistors protect the system during abnormal conditions.
Details of these features are provided in the CS1610 data sheet.
The CRD1610-15W-27V board demonstrates the performance of the CS1610. This reference board has been de-
signed for an output load of 9xLEDs in series at 470mA (
 27.0V typical).
This data sheet provides the schematic and PCB layout for the reference design board. The performance graphs
demonstrate the performance of the CS1610 dimmable-controller reference design in terms of Efficiency vs. Line
Voltage, Power Factor vs. Line Voltage, THD vs. Line Voltage, Output Current vs. Line Voltage, and Output Current
vs. Dim Angle.
Extreme caution needs to be exercised while handling this board. This board is to be used by trained professionals
only.