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 6V 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
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