LX27912IDW Datasheet/PDFLX27912IDW is a dedicated PMIC (Power Management IC) with embedded LED drivers, enabling the control and the powering of various LED configurations.
LX27912IDW owns a versatile architecture, providing a wide range of output current sources from few mA to more than 20A, ideal for many general-purpose LED and lighting applications without system start-up issues related to capacitive loads.
Application Field of LX27912IDW
The LX27912IDW LED drivers provide a versatile and effective solution for automotive and general lighting applications compliant with IEC/EN/UL 62368-1, particularly in the case of applications with no prior electrical system powering the LED light sources. For applications that require extended lifetime, the device provides software programmable current limiting and overtemperature protection, improving reliability of the system.
The LX27912IDW PMIC covers the market needs for automotive and general lighting performance, providing the perfect blend of low-cost and integration. Different configurations are possible, providing LEDs dimming, up to 5 output currents, configurable startup profiles and fault feedback for diagnostic purposes. Additionally, a NVM (non-volatile memory) save all the configuration, event and fault logs.
The device helps designers to create systems with low bill-of-material (BOM). It is the perfect fit for smart lighting applications in cars, trucks, and other rugged environments.
Working Principle of LX27912IDW
The device is a step-down (buck) current source, enabling the conversion of a higher input voltage (about 6V to 28V) into a low,programmable voltage defined by the output voltage pin. For example, when the output voltage pin (VOUT) is programmed to 1V, the current source will deliver a current of 1A, 2A if 2V, 8A if 8V, etc.
The device uses an external sense resistor to sense the current that needs to flow through the light source. It is connected between the LX27912IDW SET pin and ground, and the external resistor value needs to be defined accordingly to the desired LED current.
The device is a programmable high-performance LED current source with a control loop and feedback, designed to provide a more accurate feedback for system diagnostics. The device allows the user to adjust the current and the voltage for each LED to follow the dimming curve, prolonging the life of the system. Additionally, the device can adjust the current in order to limit the power consumed by the LEDs and avoid an over-current situation.
Conclusion
In conclusion, LX27912IDW is a perfect and economical solution for automotive and general lighting applications. As a PMIC with embedded LED drivers, it provides a wide range of output current sources and is programmable with a control loop and feedback, enabling the system to adjust current and voltage to extend the lifetime of the system and preventing any over-current situation.