IS31LT3515 Datasheet, PDF (1/2 Pages) Integrated Silicon Solution, Inc – High Voltage LED Lighting Driver for Buck, Boost or Buck-boost Topology

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
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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
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Rev.A, 10/12/2012