Three channel linear LED driver with controls for brightness and colour
Diodes has launched an automotive-compliant 55V linear LED driver with independent control of the brightness and colour of its three channels.
The AL1783Q LED driver from Diodes has current set by an external REF pin, independent dimming controls for each channel, and pulse width modulation (PWM) to perform LED dimming. It is aimed at multiple interior and exterior lighting applications in electric vehicles (EV) and internal combustion engine (ICE) vehicles as well as running lights, position lights and fog lights.
Human-centric automotive design is driving the demand for multi-channel LED drivers, which allow vehicle occupants to easily change interior lighting colours to match their mood. By simultaneously enabling animated turning-indicator signals and exterior grill lighting for different road conditions, these drivers help increase safety levels.
The industry is moving to higher voltage rails to power vehicle subsystems and this has seen battery voltages increasing from 12V and 24V to 48V. In response to this development, the AL1783Q has been designed to operate from a 55V rail, providing it with an advantage over other LED drivers which typically only operate up to 40V. This feature also enables the AL1783Q to support increasing LED chain voltages.
The LED driver also delivers up to 66% more current per channel at 250mA compared with a standard 150mA, enabling greater flexibility to support higher LED current ranges in a wider range of lighting applications. For additional flexibility, the current in each of the three channels can be set using individual resistors.
Thermal robustness is an important consideration when designing with linear LED drivers and the AL1783Q is housed in a thermally efficient TSSOP-16EP package that has an exposed cooling pad for superior heat dissipation. For added system level reliability, the AL1783Q has multiple fault detection features including undervoltage lockout (UVLO) and overvoltage protection (OVP), as well as the ability to detect LED open and short circuit conditions.
The AL1783Q is qualified to AEC-Q100, manufactured in IATF 16949 certified facilities, and supporting PPAP documentation. Supplied in the space-saving TSSOP-16EP (5.1mm x 6.6mm) package, the AL1783Q is available at $0.43 in 2,500 piece quantities.
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