MIC2287-34YML-TR

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A MIC2287-34YML-TR is a poly-phase, adjustable frequency, buck-boost LED driver. The versatile design of the MIC2287-34YML-TR enables it to operate either as a Buck, Buck-Boost or Boost LED driver. The device can be configured to drive LED strings up to 36V and with a maximum current of 34A.

Application Field

The MIC2287-34YML-TR is principally designed for driving off-line LED lighting applications where high power efficiency and accurate control of LED strings are paramount. With its integrated control loop, the MIC2287-34YML-TR ensures that LED strings are maintained in a stable state, even in dynamic operating conditions such as during start-up or AC line input voltage variations. It also offers several protections, including short-circuit, over-temperature, over-voltage and under-voltage protection. Furthermore, the MIC2287-34YML-TR features a frequency dithering feature to meet the EN61000-3-2 harmonic specification limits.

This PMIC-LED Driver offers a wide range of applications in automotive, industrial and consumer sectors. Automotive applications such as car headlights and taillights, industrial applications like architecture lighting and consumer applications such as household lighting are excellent use cases for this device. It is also suitable for powering a wide range of LEDs, including white, RGB, and infrared LEDs.

Working Principle

The MIC2287-34YML-TR uses a buck-boost topology to implement a closed-loop, continuous conduction mode (CCM) LED driver. The device is capable of operating at an adjustable frequency of 50kHz to 700kHz, making it suitable for efficient use of PCB area. The control loop comprises of a current-mode PWM controller, a logic block for fault and failure protection, an adjustable oscillator, and an error amplifier. The LED string is connected to the MIC2287-34YML-TR through its output pins, OUT1 and OUT2. The LED string and output pin connection should be done in accordance with guidelines to ensure maximum performance and power efficiency.

The device also features a wide range of integrated features to ensure optimal performance. It has an integrated low-side MOSFET, a low-side synchronous rectifier, and a peak current protection that monitors the output current of the LEDs. The MIC2287-34YML-TR also features open-loop feed-forward, active damping of ringing, an adjustable short-circuit protection, and an adjustable die-temperature protection.

In summary, the MIC2287-34YML-TR is an excellent buck-boost LED driver designed for high power efficiency and accurate control of LED strings. It offers a range of integrated features and protections to ensure optimal performance and robustness. The MIC2287-34YML-TR can be used in a wide range of applications, including automotive, industrial and consumer, making it an excellent choice for LED lighting applications.

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