ON Semiconductor NCL30081 User Manual

NCL30081LEDGEVB
3.6 W Flyback 3 LED Step
Dimmable Driver Evaluation
Board User's Manual
Overview
This documentation package covers an NCL30081 LED
driver for use in a GU10 based LED lamp. The output is
mains isolated by double insulation. Maximum input power
is 5 W. The ECA (Electronic Circuit Assembly) supports 2
versions; one step dimming and one non-dimming version.
The version is controlled through minor bill-of-material
changes. The LED current dims in 5 discrete levels
sequentially by detecting the interruption of the AC mains
briefly (about 1 s) to step the LED current down one level
until it cycles back to full current.
Modifications
The value of R sets the final output current value along
trim
with R . R is for fine adjustment. The nature of the
sense trim
open loop control makes the current adjustment somewhat
iterative based on available standard resistor values and
because of the circuit parameters that affect the output
current setting.
© Semiconductor Components Industries, LLC, 2013
March, 2013 − Rev. 0
dependent current source creates a line dependent offset on
the CS pin to account for propagation delay errors in the
peak primary current. Changing the FET or gate driver
resistor will also have some effect on the output current.
the level where power factor or harmonic current
requirements are applicable in many countries (e.g. US). In
the
IEC61000-3-2 Class C are applicable even at this low power
level. Compliance to the Class C requirements is simple with
a change of the input capacitor from 4.7 mF to 1 mF. This
change limits the input voltage operation to 200–265 V ac
because there is insufficient energy storage for the full
universal line range.
Figure 1. NCL30081LEDG Evaluation Board
1
http://onsemi.com
EVAL BOARD USER'S MANUAL
Line regulation is optimized by the selection of R
Since the input power is < 5 W maximum, this falls below
EU, the harmonic
. A line
lff
current requirements for
Publication Order Number:
EVBUM2175/D