ICL8001G / ICLS8082G
Design Guidelines
Introduction
Application Note
5
Version 2.0, 2011-04-14
1
Introduction
Objective
The objective of this application note is to describe how a dimmable, highly efficient single-stage LED driver based
on the ICL8001G / ICLS8082G primary control developed by Infineon Technologies AG can be designed and how
different design targets can be considered. For this purpose, quantitative design tools for dimensioning of the
flyback transformer for QR (quasi-resonant) operation and further discrete components relevant to the power
factor correction (PFC) and dimming control functions are provided. The design process refers to a concrete
application example of a phase cut dimmable LED driver. Explicit questions and answers are treated in conclusion.
Features of ICL8001G / ICLS8082G control
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High, stable efficiency over a wide operating range
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Optimized for trailing and leading-edge dimmers
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Precise PWM for primary PFC and dimming control
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HV power cell for VCC precharging with a constant current
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Built-in digital soft start
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Foldback correction and cycle-by-cycle peak current limitation
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VCC over/undervoltage lockout
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Auto restart mode for short circuit protection
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Adjustable latch-off mode for output overvoltage protection (OVP)
Description
The ICL8001G / ICLS8082G employs a quasi-resonant (QR) operation mode and, due to the availability of
outstanding PFC performance, is optimized for off-line LED lighting applications such as dimmable LED bulbs for
incandescent lamp replacement, LED downlights and LED tubes in a power range from typically 5 W to 50 W.
Precise PWM generation enables primary control for phase cut dimming and potential for high power factors of
PF > 99 %. Depending on the power class, significantly improved driver efficiency of up to 91 % is feasible. The
product has a wide operation range of IC voltage supply and low power consumption. Multiple safety functions
ensure full system protection in failure situations. With its full feature set and simple application, the ICL8001G /
ICLS8082G represents an outstanding choice for QR flyback designs combining feature set and performance at
a minimum BOM cost.
