LED Driver. IS31LT3935 Datasheet


IS31LT3935 Driver. Datasheet pdf. Equivalent


IS31LT3935


TRIAC Dimmable AC/DC LED Driver
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 Shutdow...



IS31LT3935
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

IS31LT3935
IS31LT3935
PIN CONFIGURATION
Package
Top View
DFN-10
3x3 (Exposed Pad)
10-LEAD (3mm x 3mm) PLASTIC DFN
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
PIN DESCRIPTION – (PINOUT IS SUBJECT TO CHANGE BASED)
Pin # Name Type
Description
1 VCC Power Input power supply pin for the IC
2 VIN Input Scaled line input voltage. Used to control the TRIAC bias circuit block.
3 VSINE
4 SST
5 FSET
6 CS
7 GATE
8 RMAG
9 CAVG
10
11
*Note1
BLD
GND
I/O
Input
I/O
Input
Output
Input
Input
Input
Power
Scaled line input voltage. Used to shape the inductor current to match line input
voltage.
Soft-start input. Connect a capacitor between this pin and GND to control startup delay
time
Frequency select pin. Connect a resistor between this pin and GND to set the base
operating frequency of the IC.
Inductor current sense input pin.
Gate drive output. Connect to the gate of the power NMOS.
Bleeder current set pin. Connect a resistor between this pin and GND to set the
magnitude of the bleeder current for the TRIAC based dimmer.
Bleeder circuit averaging capacitor. Connect a capacitor between this pin and RMAG
to control the bleeder current average function.
Bleeder current path. Connect this pin to the output of the linear regulator via a diode
to provide bleeder current for the TRIAC dimmer.
Ground connection. Connect the exposed pad to GND to provide the power return for
the IC supply.
*Note 1: Exposed pad (Pin 11) is GND, must be soldered to GND for the IC to operate.
ORDERING INFORMATION
INDUSTRIAL RANGE: -40°C TO +85°C
Order Part No.
Package
IS31LT3935-DLS2-TR DFN10 (3x3)
QTY/Reel
2500
Integrated Silicon Solution, Inc. – www.issi.com - 1-800-379-4774
Rev. C, 07/19/2013
2




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