Allegro MicroSystems推出恒定电流3安培降压稳压器LED驱动器

The A6211 is a single IC switching regulator that provides constant-current output to drive high-power LEDs. It integrates a high-side N-channel DMOS switch for DC-to-DC step- down (buck) conversion. A true average current is output using a cycle-by-cycle, controlled on-time method.

Output current is user-selectable by an external current sense resistor. Output voltage is automatically adjusted to drive various numbers of LEDs in a single string. This ensures the optimal system efficiency.

LED dimming is accomplished by a direct logic input pulse width modulation (PWM) signal at the enable pin.

The device is provided in a compact 8-pin narrow SOIC package (suffix LJ) with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

Features & Benefits:

Supply voltage 6 to 48 V True average output current control 3.0 A maximum 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 typical) Robust protection against: Adjacent pin-to-pin short Pin-to-GND short Component open/short faults