The LM3463 is a wide-input voltage LED driver with multiple dimming control modes that maximises system efficiency and reduces complexity in LED area lighting applications, such as street, high-bay and ceiling lights.
The IC is a 12 V to 95 V input voltage, six-channel LED current controller. It drives up to 28 LEDs per string with dimming control that is easily managed by an external microcontroller via the dimming input pins. It works in conjunction with external N-channel MOSFETs and sense resistors to accurately and individually regulate current to each LED string.
Dynamic headroom control improves system efficiency by automatically adjusting the LED supply to the lowest level required for LED current conduction.
Three dimming modes simplify operation with common control systems: PWM input signals, analog-to-PWM input control or 4-Byte data code. Global analog brightness control operates independently of dimming control modes and can be used for thermal foldback, protecting the LED array from over-temperature conditions.
Multiple LM3463s can be cascaded in a master-slave configuration for applications requiring more than six-string LED operation. Protection features include input under-voltage lockout, LED open/short circuit, MOSFET thermal protection and over-temperature shutdown. A fault output signal can be used to notify the system controller of an open LED string.
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