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Elmos taillight LED controller ensures even energy distribution

Elmos taillight LED controller ensures even energy distribution

By BizLED Bureau

Nov 20, 2017: With the E522.90/91/92/93 ICs, Elmos is presenting a product family of LED controllers for use in automotive rear lighting. The E522.9x family has an output current of 14mA to 55mA per channel. Up to 165mA/IC is possible in parallel operation. Patented power management ensures a constant lighting intensity of the LEDs even under difficult thermal conditions. A variable proportion of the incurred power loss is shifted to external shunts for this purpose, enabling even and effective heat distribution without hot spots on the PCB. Here the unique dual concept avoids an additional drop via the linear controller stage.

Additional characteristics include comprehensive diagnosis features that ensure reliable system operation through LED driver open/short recognition, IR config open/short, barrier layer temperature control and overvoltage control.

Both joint and channel-specific PWM dimming are provided. A “RUN” diagnosis interface supports the operation of LED clusters with more than three phases, which are then supplied with current by connected ICs.

Full compatibility with the E522.80-83 ICs that deliver 48mA up to 151mA permits drop-in replacement for extremely easy adaptation of existing systems.

The ICs offer two configurable operating modes for error handling: “Failure Feedback Mode” on the one hand (when an error is identified, the affected channel is deactivated and the individual error is signalled) and, on the other hand, “Single Lamp Mode” where all connected LED phases act as a single connected light source. All channels are turned off here if an error occurs, and the IC merely draws a low standby current from the supply in this case – thus the supplying control unit can detect a failure clearly and positively.

The input voltage range is specified at 5V to 25V, with a maximum value of 40V.

The semiconductor family is delivered in a SO16N housing with exposed die pad and is qualified according to AEC-Q100.

For further information, application notes, evaluation kits and samples, please send an e-mail to [email protected] with “E522.9x” in the subject line, visit our website at www.elmos.com or contact us by telephone: + 49 231 7549 100.

E522.90/91/92/93 family features independent triple linear high-side current sources for LED driving. Diagnostic features are provided to meet automotive requirements, together with a communication interface “RUN” to link ICs fault handling. Individual current configuration and independent digital PWM dimming per channel are available (e.g. for RGB). Full functional compatibility with higher current versions E522.80-83 allows drop-in replacement and thus simplest adaption of existing solutions in current range.

Two external configurable modes of operation allow either “Failure Feedback Mode” FFM (operating channels in case of errors, with error signalization) or in “Single Lamp Mode” (turning all linked E522.9x´s channels “off” in case of errors).

An intelligent power management system is provided using an external shunt resistor to share power distribution be-tween E522.9x and external heat sink. Hotspot generation can be avoided by flexible heat spreading. Internal derating for reference voltage and over-temperature shut-down for extreme temperatures >180°C protect E522.9x in case of ab-normal operation conditions.

A high voltage capable input ENA can be used to either dig-itally enable or disable E522.9x. Furthermore, ENA may be used as analog reference voltage input.according to AEC-Q100.

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