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LED Indication - Discrete

Discrete LEDs are used to provide visual indication in a variety of applications, from domestic appliance displays to automotive user interfaces. The HLMP-Q100-N0011 from Broadcom is a single-die, 2-element LED with a segmented phosphor that provides discrete output for two different wavelengths, allowing for two different colors to be emitted from a single die. This technology is perfect for applications requiring simple visual indications, or for adding an attractive backlighting effect.

Application Field

The HLMP-Q100-N0011 is designed for two primary uses: as an indicator for user interfaces or as a backlighting for graphic displays. User interface indicators may be mounted on or within appliance control panels, switch boxes or dashboard instruments, allowing users to quickly identify a particular device or operational Status. Backlighting for graphic displays can be used to create appealing visual effects, improving user experience and brand perception.

The HLMP-Q100-N0011 is also suitable for a range of other applications, including:

• Illuminating display components in audio/video, mobile and navigation systems
• Providing interior trim illumination in automotive consoles and cockpits
• Highlighting selectable options in client-based business systems
• Identifying particular objects, such as illuminating door handles or drawer handles

Working Principle

The 2-element design of the HLMP-Q100-N0011 allows for two different wavelengths to be emitted, each slightly offset to create a vivid, crisp colour. Signals to drive the HLMP-Q100-N0011 can be supplied in either a constant current or constant voltage configuration.

For constant current mode, an external current source is employed to set the full-scale current for each element, with a PWM signal modulating each to give intensity levels. In constant voltage mode, the voltage applied to each element simply converts to a corresponding current, eliminating the need for a costly, external current source.

Each element may also be configured for ‘push-on, push-off’ operation, providing a simple way of switching between two output levels. This makes the HLMP-Q100-N0011 ideal for applications such as illuminated switches and indicators, adding a stylish, modern feel to traditional controls.

Conclusion

The HLMP-Q100-N0011 is a versatile, single-die LED that can provide discrete output in two distinct wavelengths. The simple, push-on/push-off operation makes it a capable choice for user interface and backlighting applications, allowing for a range of styles and effects to be created. The HLMP-Q100-N0011 is ideal for any project looking to add a modern visual touch to user interfaces or graphics displays.

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