Cirrus Logic CRD1615A-8W - Manual (Page 3)

CRD1615A-8W
DS1043RD2 3
1. INTRODUCTION
The CS1615A is a 120VAC quasi-resonant flyback mode dimmable LED controller IC. The CS1615A uses a digital
control algorithm that is optimized for high efficiency and > 0.99 power factor over an input voltage range (108VAC
to 132VAC). The CS1615A integrates a dimmer compatibility circuit with a constant output current, quasi-resonant
flyback stage. An adaptive dimmer compatibility algorithm controls the dimmer compatibility operation mode to en-
able flicker-free operation from 0% to 100% output current with leading-edge, trailing-edge, and digital dimmers.
The CRD1615A-8W 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.
When using the CS1615A for a design that does not require active clamp circuitry, the CLAMP pin should be left
floating. Details of these features are provided in the CS1615A/16A data sheet DS1033 Single Stage Dimmable
Controller for LED Lamps.
The CRD1615A-8W board demonstrates the performance of the CS1615A. This reference board has been de-
signed for an output load of 10

LEDs in series at 250mA (

30.0V typical).
This data sheet provides the schematic and PCB layout for the reference design board. The performance graphs
demonstrate the performance of the CS1615A 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.