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AL5802 - CURRENT SINK LED DRIVER

Description

The AL5802 combines a high gain NPN transistor with a pre-biased NPN transistor to make a simple small footprint LED driver.

The LED current is set by an external resistor connected from REXT pin (6) to GND pin (4).

Features

  • Reference voltage VRSET = 0.65V.
  • -40 to +125°C temperature range.
  • 0.8V to 30V open-collector output.
  • Negative temperature co-efficient automatically reduces the LED current at high temperatures.
  • Low thermal impedance SOT26 with copper lead-frame.
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2).
  • Halogen- and Antimony-Free. “Green” Device (Note 3).
  • For automotive.

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Full PDF Text Transcription

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AL5802 LINEAR MODE CURRENT SINK LED DRIVER Description The AL5802 combines a high gain NPN transistor with a pre-biased NPN transistor to make a simple small footprint LED driver. The LED current is set by an external resistor connected from REXT pin (6) to GND pin (4). The internal high gain transistor develops approximately 0.6V across the external resistor. The AL5802’s open-collector output can operate from 0.8V to 30V, making it suitable for industry-standard 5V to 24V power supplies without additional components. PWM dimming of the LED current can be achieved by either driving the BIAS pin (2) with a low impedance voltage source, or driving the EN pin (3) with an external open-collector NPN transistor or opendrain N-channel MOSFET.
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