XR46051IHBTR

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PMIC - LED Drivers are specific types of electrical circuit boards that control the brightness and power of light emitting diodes (LEDs). The XR46051IHBTR is an example of one such PMIC - LED Drivers. It is a high performance, low cost, ultra-small, high current LED driver that can be used in any application requiring the regulation of a load current with multiple string control.

Functionality of XR46051IHBTR

The XR46051IHBTR is a programmable linear current mode constant current driver, designed for driving single and multi-string LEDs. It is also capable of controlling dimming, flicker-free transition, and over-current protection of the LEDs. It has multiple control inputs, which allow for various control schemes including PWM control, potentiometer adjustment, and intrinsic YGE dimming.

The XR46051IHBTR has an adjustable current range from 70mA to 20A, which allows for a wide variety of LED driver applications. Furthermore, the internal use of normal temperature qualified components and current sense resistors (CSRs) enables the XR46051IHBTR to achieve a low minimum BOM cost. The integrated Transformer/SMPS mode provides extra power efficiency, thus increasing total system efficiency.

Working Principle of XR46051IHBTR

The XR46051IHBTR works based on an Internal Modulation Control (IMC) architecture. The IMC architecture provides a stable loop performance over temperature and voltage variations. To achieve this, the XR46051IHBTR includes a unique topology.

At the heart of the topology is the current-sense resistor (CSR). The CSR is connected to the LED leads for sensing the current. It is also connected to the IMC circuitry, which compares the sensed current with the programmed current and adjusts the voltage accordingly to keep the current regulation constant.

The XR46051IHBTR employs a combination of both N-channel and P-channel MOSFETs for driving the output loads. The Pulse Width Modulation (PWM) feature is used to control the duty cycle of the N-channel MOSFET and thus, the current output of the XR46051IHBTR.

In addition, the XR46051IHBTR offers external YGE dimmer interface, which helps to reduce the inrush current while avoiding potential a triac solutions that can interfere with other systems. The XR46051IHBTR also includes PWM input, potentiometer input, and temperature compensation input for LCD panel dimming.

The Advantages of XR46051IHBTR

The XR46051IHBTR provides several advantages over other models of PMIC - LED drivers. Firstly, it has a wide adjustability, making it suitable for various platforms from automotive, consumer and industrial, to medical and avionics applications. Secondly, its integration and low BOM cost, combined with improved power efficiency make it one of the most cost-effective solutions for LED applications.

Lastly, its small package, low inductance resistance and thermal performance, integrates flexible control and dimming interfaces, and high efficiency linear current regulation and dimming all make it the most reliable solution for holding higher wattage and multi-string LED applications.

Conclusion

The XR46051IHBTR provides a reliable, low cost and efficient solution for applications requiring LED current control, dimming, and over-current protection. It is capable of driving high wattage LEDs and has a wide range of adjustability, making it suitable for various applications. Overall, the XR46051IHBTR is a versatile and cost effective choice for PMIC - LED driver applications.

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