PT4115 product image


30V, 1.2A Step-down High Brightness LED Driver with 5000:1 Dimming


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 is available in SOT89-5 and ESOP8 packages.


PT4115 Features


  • ● Simple low parts count
  • ● Wide input voltage range: 6V to 30V
  • ● Up to 1.2A output current
  • ● Single pin on/off and brightness control using DC voltage or PWM
  • ● Up to 1MHz switching frequency
  • ● Typical 5% output current accuracy
  • ● Inherent open-circuit LED protection
  • ● High efficiency (up to 97%)
  • ● High-Side Current Sense
  • ● Hysteretic Control: No Compensatio
  • ● Adjustable Constant LED Current
  • ● ESOP8 package for large output power application


PT4115 Applications


  • ● Low voltage halogen replacement LEDs
  • ● Automotive lighting
  • ● Low voltage industrial lighting
  • ● LED back-up lighting
  • ● Illuminated signs
  • ● SELV lighting
  • ● LCD TV backlighting
Maximum Supply Voltage VIN-0.3 to 45 V
Maximum Drain of the internal power switch SW-0.3 to 45 V
Maximum Current sense input (Respect to VIN) CSN+0.3 to (-6.0) V
Maximum Logic level dimming input DIM-0.3 to 6 V
Maximum Switch output current ISW1.5 A
Maximum Power Dissipation PDMAX1.5 W
Maximum Thermal Resistance, SOT89-5 θJA PTR45 °C /W
Maximum Thermal Resistance, ESOP8 θJA PTR40 °C /W
Maximum Operation Junction Temperature Range TJ-40 to 150 °C
Maximum Storage Temperature TSTG-55 to 150 °C
Maximum ESD Susceptibility2 kV
PT4115 Replacement Parts
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