PT4115LED Driver with 5000:1

The PT4115 is a continuous conduction mode inductive
step-down converter, designed for driving single or
multiple series connected LED efficiently from a
voltage source higher than the total LED chain voltage.
The device operates from an input supply between 8V
and 30V and provides an externally adjustable output
current of up to 1.2A. Depending upon the supply
voltage and external components, the PT4115can
provide more than 30 watts of output power.
The PT4115 includes the power switch and a high-side
output current sensing circuit, which uses an external
resistor to set the nominal average output current, and a
dedicated DIM input accepts either a DC voltage or a
wide range of pulsed dimming. Applying a voltage of
0.3V or lower to the DIM pin turns the output off and
switches the device into a low current standby state.
The PT4115 is available in SOT89-5 packages.