A6211 LED Driver

By Allegro MicroSystems, LLC 72

A6211 LED Driver

The A6211 is a switching buck regulator LED driver that provides constant-current output to drive high-power LEDs. With a wide input supply voltage from 6 V to 48 V, Allegro's A6211 device integrates a high-side N-channel MOSFET switch for DC-to-DC stepdown (buck) conversion. A true average current is output using a cycle-by-cycle, controlled on-time method. This new device has significant fault protection advantages including design techniques to address pin-pin shorts, pin-ground shorts and open and shorted external components. The A6211 is designed for the consumer, industrial, and architectural lighting markets in addition to light bars for scanners and multi-function printers.

  • Supply voltage from 6 V to 48 V
  • True average output-current control
  • 3.0 A (max.) output over operating temperature range
  • Cycle-by-cycle current limit
  • Integrated MOSFET switch
  • Dimming via direct logic input or power supply voltage
  • Internal control loop compensation
  • Undervoltage lockout (UVLO) and thermal shutdown protection
  • Low power shutdown [1 µA (typ.)]
  • General illumination
  • Scanners and multi-function printers (light bars)
  • Architectural lighting
  • Industrial lighting
  • Display case lighting / MR16