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 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 voltage from LD pin for analog dimming. Input
PWM signal from PWM pin can get either analog
dimming or PWM dimming.
The IS31LT3515 is available in SOP-16 package and