LM27951SD

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The LM27951SD is a very versatile power management integrated circuit (PMIC) designed specifically for LED drivers and other DC applications that require a wide range of voltage regulation, current monitoring, and digital control. It is integrated with an advanced boost converter that offers a fast response time to changes in input and output voltages, as well as integrated over-voltage, over-current, and overtemperature protection. It also includes a wide variety of performance monitoring, fault protection, and feedback circuitry, allowing the LM27951SD to be used in a wide range of applications.

The LM27951SD is a step-upDC-DC converter designed for driving LEDs from a single-ended or an adjustable output voltage. It is capable of operating from an input voltage range from 2.5 V to 72 V and provides a pulse-by-pulse current limit for driving high-current LEDs. The step-up dc-dc converter topology enables the device to power both low-voltage and high-voltage LED strings, while minimizing the risk of failure due to thermal runaway and providing flexibility to optimize LED brightness and power efficiency.

The device offers a wide range of performance and protection features, including a minimum input/output voltage limit, a maximum output current limit, and an adjustable current limit. It also offers a slew rate (adjustable) soft-start and can be programmed with a digital serial interface to allow fine tuning of the output voltage. The device includes an over-voltage and over-temperature protection to safeguard the LEDs from any unexpected events and to ensure the expected lifetime of the LEDs.

In addition, the LM27951SD is designed with an internal slope compensation to minimize ripple and maintain a consistent output voltage during light load conditions and a programmable transition from PFM (pulse-frequency modulation) to PWM (pulse-width modulation) mode for a more efficient operation. Furthermore, the device can be programmed to perform dimming and flickering as desired.

The LM27951SD is ideal for driving LEDs from a single-ended or an adjustable outputvoltage. It can provide high-current and high-efficiency operation while minimizing the risk of thermal runaway and eliminating the need for temperature guardbanding. Its wide range of performance and protection features allow it to be used in a wide range of applications. Furthermore, its versatile programming interface enables a number of customization options to optimize LED performance and power efficiency.

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