LM5051MAE/NOPB

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Power management integrated circuits (PMICs) are integrated circuits used to manage power in electronic devices. They provide functions such as power-supply sequencing and sequencing, overvoltage or overcurrent protection, voltage and current regulation, power-supply monitoring and control, power-supply efficiency, and thermal protection. The LM5051MAE/NOPB is a Power Management Integrated Circuit (PMIC) belonging in the Power Management ICs - OR Controllers, Ideal Diodes family.

The LM5051MAE/NOPB is a current-mode, adaptive on-time PWM controller optimized for offline and on-line AC/DC power supplies up to 500 Watts. It integrates many technologies to provide high efficiency and accurate power supply control. These technologies include an adaptive on-time low-side current-mode control, active-Miller clamping, adaptive capacitance control, a novel pulse-by pulse current limiting scheme, and comprehensive power-supply protection (undervoltage lockout, overvoltage shutdown, overtemperature shutdown).

The LM5051MAE/NOPB discovers the optimal on-time by operating from a low-side current - mode control loop. The peak current in the power stage sets the level of the controlling current, which is then pulled low when the voltage across the switches exceeds the upper limit of the control loop\'s dynamic range. Compared to traditional designs, this greatly reduces turn-off losses, reduces switching losses, and improves overall efficiency.

The LM5051MAE/NOPB utilizes the active-Miller clamping feature to limit the voltage stress on the switches. Activate Miller clamping is implemented using an independent power stage, which is triggered when the switch voltage exceeds the preset threshold. This allows the switches to have longer conduction times without compromising the leakage current, and helps reduce the power supply\'s total power dissipation.

The LM5051MAE/NOPB employs an adaptive capacitance control function. This function dynamically adjusts the capacitor charging and discharging times to maintain a tight voltage ripple at the output. The adaptive capacitance control allows for a higher system efficiency because the power stage does not need to be run in a linear mode continuously.

The LM5051MAE/NOPB also features a novel pulse-by-pulse current limiting scheme. This feature senses an excessive current in the power stage, and then actively turns off the switches and reduces their duty cycle until the current drops to a safe level. This feature allows the system to limit the peak current when the load changes suddenly, thereby improving system reliability.

Finally, the LM5051MAE/NOPB incorporates a comprehensive set of power supply protection features, such as overvoltage protection, overcurrent protection, and overtemperature protection. The overvoltage protection prevents the output voltage from exceeding the preset limit by permanently turning off the power switch if the limit is exceeded. The overcurrent protection limits the maximum output current of the power supply to a safe level. Lastly, the overtemperature protection turns off the power switch if the junction temperature exceeds a preset limit.

In summary, the LM5051MAE/NOPB is an excellent choice for a wide range of AC/DC power supply applications, due to its high efficiency, low power dissipation, and robust protection features.

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