User guide

AN375
AN375REV4 3
2 Introduction
This application note is a guide to designing a solid-state lighting (SSL) LED lamp circuit using Cirrus Logic's
CS1615/16. The first half of the design guide presents a step-by-step design procedure for calculating the required
components for each stage of the system. The second half of the document uses a CRD1615 reference design as
an example to verify the design procedure. The CS1615 example is based on the Cirrus Logic CRD1615-8W flyback
reference design. See the CS1615/16 Single Stage Dimmable Offline AC/DC Controller for LED Lamps data sheet
for more details about the CS1615/16 IC. See the CRD1615-8W 8 Watt Reference Design and CRD1616-8W 8 Watt
Reference Design data sheet for more details regarding the reference design.
Further Reading
• Cirrus Logic, 2013. “CS1615/16 Single Stage Dimmable Offline AC/DC Controller for LED Lamps,”
DS961F1, JUL 2013.
• Cirrus Logic, 2013. “CS1615/16 Calculator to Support Application Note AN375,” SS375REV4, JUL 2013.
• Cirrus Logic, 2013. “CRD1615-8W 8 Watt Reference Design,” DS1002RD3, JUL 2013.
• Cirrus Logic, 2013. “AN376 Single Stage Output Ripple Current and the Effect on Load Current in an LED
Driver,” AN376REV2, JUL 2013.
2.1 Definition of Acronyms
Acronym Description
PFC Power Factor Correction
ZCD Zero-current Detection
OVP Overvoltage Protection
eOTP External Overtemperature Protection
OCP Overcurrent Protection
iOTP Internal Overtemperature Protection
OLP Open Loop Protection
LED Light Emitting Diode
TXF Transformer
TRIAC
TRIode for Alternating Current, which is an electronic component that can conduct current
in either direction when it is triggered. It is formally called a bidirectional triode thyristor.
FET Field-effect Transistor
SSL
Solid-state lighting. Refers to a type of lighting that uses semiconductor LEDs as a source
of illumination rather than electrical filaments, plasma, or gas.
THD Total Harmonic Distortion
NTC Negative Temperature Coefficient thermistor