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PDF IS31LT3935 Data sheet ( Hoja de datos )
| Número de pieza | IS31LT3935 | |
| Descripción | TRIAC Dimmable AC/DC LED Driver | |
| Fabricantes | ISSI | |
| Logotipo |  |
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Flicker-FreeTM IS31LT3935
TRIAC Dimmable AC/DC LED Driver with Active PFC
March 2013
Preliminary
GENERAL DESCRIPTION
The Flicker-Free™ 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.
TYPICAL APPLICATIONS
• Dimmable Retrofit LED Lamps/Luminaries up to 30W
• Industrial and Commercial Lighting
• Offline LED Driver Modules and Bricks
FEATURES
• Smooth 0-100% Flicker-free Dimming Range
• Compatibility with all TRIAC Dimmers (Digital,
Leading and Trailing-edge)
• Nearunity PFC without External PFC Circuitry
• SpreadSpectrum Switching for Reduced EMI
• Low 500µA Quiescent Current
• Protections:
Soft Start
Under-voltage, (Over-voltage) Lockout
Thermal Shutdown)
DIMMING PERFORMANCE
• Power Factor = 0.99 at 13W output
• Power Factor = 0.91 at 1W output
• Efficiency: 87% from 120Vrms to 39Vdc at full power
• Efficiency: 85% from 120Vrms to 23Vdc at full power
• Efficiency: >82% down to 2W output
• 0~100% Light Output and anything in between
• No flicker over Full Dimming Range
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Schematic
Copyright © 2013 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of
the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before
placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life
support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com - 1-800-379-4774
Rev. B, 03/12/2013
1
1 page  
IS31LT3935
Functional Block Diagram
Figure 2 Typical Application Schematic
FUNCTIONAL DESCRIPTION
The IS31LT3935 is a high performance off-line AC/DC
LED controller for dimmable LED retrofit lamps and
luminaries using patent pending dimming technology to
eliminate visible light flicker. It can work with all types of
wall dimmers including leading-edge and trailing-edge
dimmers. The controller can also work when no dimmer
is connected.
The IS31LT3935 uses primary-feedback technology to
remove the need for secondary feedback circuitry while
achieving excellent line and load regulation. It eliminates
the need for external loop compensation components
while maintaining stable overall operating conditions.
Pulse-by-pulse waveform analysis allows for accurate
LED current regulations. On every clock cycle, the
oscillator sends a pulse of minimum on- time to the
control logic. Nominal switching frequency is determined
by the value of the resistor attached between FSET and
ground, with approximately 10% variation due to spread
spectrum modulation. Provided there is no fault condition
(UV or OT or OC high), the driver will switch the GATE
high. GATE will stay high until VCS ~= VVSINE/10, and will
switch low once that condition is met, or the over current
comparator switches.
The proprietary bleed circuitry provides current such that
TRIAC based dimmers properly switch and more
sophisticated electronic dimmers maintain proper
functionality even in their standby state.
Integrated Silicon Solution, Inc. – www.issi.com - 1-800-379-4774
Rev. C, 07/19/2013
5
5 Page 
IS31LT3935
PACKAGE OUTLINE DRAWING
10 LEAD THIN DUAL FLAT PACKAGE (DFN) WITH E-PAD
LIFE SUPPORT POLICY
ISSI products are not authorized for use as critical components in life support devices or systems without the express written approval of the CEO of ISSI. As used
herein:
1. A life support device or system is one which, (i) is intended for surgical implant into the body, or (ii) supports or sustains life, and (iii) whose failure to perform, when
properly used in accordance with instructions for use, can be reasonably expected to result in significant injury or death to the user.
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
©2013, ISSI, Inc.
Integrated Silicon Solution, Inc. – www.issi.com - 1-800-379-4774
Rev. C, 07/19/2013
11
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| PDF Descargar | [ Datasheet IS31LT3935.PDF ] | |
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