概觀
The IS31LT3360 is a continuous mode inductive
step-down converter, designed for driving a single
LED or multiple series connected LEDs efficiently
from a voltage source higher than the LED voltage.
The chip operates from an input supply between 6V
and 40V and provides an externally adjustable output
current of up to 1.2A.
The IS31LT3360 includes an integrated output
switch and a high-side output current sensing circuit,
which uses an external resistor to set the nominal
average output current.
Output current can be adjusted linearly by applying
an external control signal to the ADJ pin. The ADJ
pin will accept either a DC voltage or a PWM
waveform. This will provide either a continuous or a
gated output current.
Applying a voltage less than 0.2V to the ADJ pin
turns the output off and switches the chip into a low
current standby state.
The chip is assembled in SOT89-5 package. It
operates from 6V to 40V over two temperature
ranges of -40°C to +105°C and -40°C to +125°C.