ISSI Flicker-Free IS31LT3935 Manual

IS31LT3935 Bulb Lighting Evaluation Board Guide
Description
The Flicker-FreeTM IS31LT3935 is a single stage current
mode LED driver optimized for high power factor and
compatibility with all TRIAC dimmers. The PFC architecture
enables excellent power factor over a wide range of operating
line and load conditions, even with the simplest of inductor
based driver topologies, thereby reducing system cost and
size while maximizing efficiency.
The IS31LT3935 LED controller features patent pending
AccuDim™ flicker-free dimming technology that mimics the
characteristics of an incandescent light bulb. It presents a
dynamic impedance to the dimmer and integrates an active
bleed circuit for true dimming performance across all
dimmers.
The device is available in a tiny 10 lead DFN-EP (3mm ×3mm)
package. It operates over the temperature range of -40°C to
+85°C.
Features
● Smooth 0-100% Flicker-free Dimming Range
● Compatibility with all TRIAC Dimmers (Digital, Leading
and Trailing-edge)
● Near unity PFC without External PFC Circuitry
● Spread Spectrum Switching for Reduced EMI
● Low 500μA Quiescent Current
● Protections:
● Soft Start
● Under-voltage, (Over-voltage) Lockout
● Thermal Shutdown
Applications
● Dimmable Retrofit LED Lamps and Luminaries up to 30W
● Industrial and Commercial Lighting
● Offline LED Driver Modules and Bricks
Quick Start
Recommended Equipment
● 85~265VAC/50~60Hz power supply
For pricing, delivery, and ordering information, please contact ISSI at
or call +1-408-969-6600
Integrated Silicon Solution, Inc. – www.issi.com
R1.0, 18/04/2013
● LED array(12 in series )40Vdc-0.37A
● 220V input TRIAC Dimmer
Absolute Maximum Ratings
●≤ 264VAC power supply
●≤ 47V Vout (Total Vf)
Caution: Do not exceed the conditions listed above,
otherwise the board will be damaged or the output will
be limited
Procedure
The IS31LT3935 DEMO Board is fully assembled and tested.
Follow the steps listed below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1) Connect the positive terminal of the LEDs to the LED+ of
the DEMO and the negative terminal of the LEDs to the
LED- of the Evaluation Board.
2) Connect the input pin N of the Evaluation Board via the
main power switch to AC power supply N.
3) Connect the input pin L of the Evaluation Board via
TRAIC Dimmer pin L, Another pin of TRAIC Dimmer
Connect to the AC power supply L.
4) Turn on the power supply, Adjust the angle of TRAIC
Dimmer
Ordering Information
PART#
IS31LT3935-DLS2-TR
1
TEMP IC
RANGE PACKAGE
DFN-10
-40 to 125°C
(Exposed Pad)
analog_mkt@issi.com
1