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STMicroelectronics LED5000

3 A monolithic step-down current source with dimming capability

Overview

TopologyBoost Converter
Input voltage5.5-48 V
Switching frequency600-1000 kHz
Output 13 A
IC revision4

Description

The LED5000 device is an 850 kHz fixed switching frequency monolithic step-down DC-DC converter designed to operate as a precise constant current source with an adjustable current capability up to 3 A DC. The embedded PWM dimming circuitry features LED brightness control. The regulated output current level is set by connecting a sensing resistor to the feedback pin. The 200 mV typical RSENSEvoltage drop enhances performance in terms of efficiency. The size of the overall application is minimized thanks to the high switching frequency and its compatibility with ceramic output capacitors. The device is fully protected against overheating, overcurrent and output short-circuit. The LED5000 is available in an HSOP8 package.

Features

  • 5.5 V to 48 V operating input voltage range
  • 850 kHz fixed switching frequency
  • 200 mV typ. current sense voltage drop
  • Buck / buck-boost / floating boost topologies
  • PWM dimming
  • ± 3% output current accuracy overtemperature
  • 200 m typical RDSON
  • Peak current mode architecture
  • Short-circuit protection
  • Compliant with ceramic output capacitors
  • Inhibit for zero current consumption
  • Thermal shutdown

Remarks:Refer page num 27 for more inductor values.

Typical applications

  • Street lighting
  • Halogen bulb replacement
  • Signage
  • High brightness LED driving
  • General lighting

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