IS31LT3515 Lighting Driver Datasheet

IS31LT3515 Datasheet, PDF, Equivalent


Part Number

IS31LT3515

Description

High Voltage LED Lighting Driver

Manufacture

ISSI

Total Page 2 Pages
Datasheet
Download IS31LT3515 Datasheet


IS31LT3515
IS31LT3515
Preliminary
High Voltage LED Lighting Driver for Buck, Boost or Buck-boost Topology
September 2012
General Description
Features
The IS31LT3515 is a current mode PWM controller
designed to drive an external MOSFET for high current
LED applications. With a current sense amplifier
threshold of 250mV, the LED current is programmable
with one external current sense resistor. The
IS31LT3515 is ideal for buck, boost or buck-boost
operation. With 250kHz operating frequency (typical,
and this frequency can be set up by external resistor),
the external inductor and capacitors can be small while
maintaining high efficiency.
Dimming can be either analog or PWM digital. Input DC
Wide voltage: Vin up to 40V, Vout up to higer
Buck, Boost or Buck-Boost operation
Easy dimming: Analog, PWM or PWM converting to
analog with an external capacitor
Output over voltage protection(OVP)
Internal soft start to avoid inrush current
Current mode PWM with an 250kHz operating
frequency(typical, RSET=150Kohms)
Output short circuit protection
VIN under voltage lock out and Over temperature
protection(OTP)
voltage from LD pin for analog dimming. Input PWM
signal from PWM pin can get either analog dimming or
PWM dimming.
The SN3515 is available in SOP-16 package and
QFN-16 3*3 package.
Applications
General industrial high power LED lighting
Desk lights and room lighting, street lighting
Display backlight
Typical Application Circuit
Buck Boost configuration
Copyright © 2011 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
Rev.A, 10/12/2012
1

IS31LT3515
IS31LT3515
Pin Configuration
Package
Preliminary
Pin Configurations(Top view)
SOP-16
Pin Description
Pin No. Pin Name
1 VCC
2 PWMD
3
4
5,12
6
7
8
9
10
11
12
13
14
15
16
EN
LD
GND
OPT
FSET
CSsense
OVP
ISN
ISP
GND
CS
FAULT
GATE
VCCout
Function
The power supply pin
PWM dimming input. The PWM signal will convert to analog signal with an
external capacitor. (Low is enable, internal have pull down resistor)
Enable Pin. Floating(pull down internal), enable; pull to high, shutdown
mode
Analog dimming input.
Ground
Structure selection. Floating: boost. connect to ground: buck-boost
With an external resistor to set operation frequency. (250KHz,
RFSET=150kohms)
current sense mirror pin, connect a res to CS pin(1:5000)
Over voltage protect, this pin voltage exceed 1.23V, GATE will pull low.
The LED current sense amplifier negative input
The LED current sense amplifier positive input
Ground
MOSFET current sense
This pin is the same as PWM signal and when ISP-ISN>0.5v, pulled to
ground (short circuit is detected)
Gate drive to the external MOSFET(12V)
LDO 12V output , need an external cap(1uF)
ORDERING INFORMATION
INDUSTRIAL RANGE: -40°C TO +85°C
Order Part No.
Package
IS31LT3515-GRLS2-TR SOP-16, Lead-free
QTY/Reel
2500
Integrated Silicon Solution, Inc. www.issi.com
Rev.A, 10/12/2012
2


Features IS31LT3515 Preliminary High Voltage LE D Lighting Driver for Buck, Boost or Bu ck-boost Topology September 2012 Gene ral Description Features The IS31LT35 15 is a current mode PWM controller des igned to drive an external MOSFET for h igh current LED applications. With a cu rrent sense amplifier threshold of 250m V, the LED current is programmable with one external current sense resistor. T he IS31LT3515 is ideal for buck, boost or buck-boost operation. With 250kHz op erating frequency (typical, and this fr equency can be set up by external resis tor), the external inductor and capacit ors can be small while maintaining high efficiency. Dimming can be either anal og or PWM digital. Input DC  Wide v oltage: Vin up to 40V, Vout up to higer  Buck, Boost or Buck-Boost operatio n  Easy dimming: Analog, PWM or PWM converting to analog with an external c apacitor  Output over voltage protec tion(OVP)  Internal soft start to av oid inrush current  Current mode PWM with an 250kHz operating frequency(.
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