BD3551HFN-TR

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BD3551HFN-TR is a type of device in PMIC (Power Management Integrated Circuit) that belongs to Voltage Regulators Linear. It is a linear integrated circuit designed for voltage control in the main circuit of regulated power supplies. It is able to offer voltage regulation and current limiting functions, has protection from short-circuit and thermal shut-off, and provides dropout voltage that is low enough to ensure stability and minimum harmonics.

The application of BD3551HFN-TR can be found in USB HUBs, Notebooks, Monitors and Power Supplies, for example. It provides a stable and accurate output voltage even when original main input voltage is varied, as well as a quick response time.

The working principle of BD3551HFN-TR is the control system of operating circuits in order to change the output voltage. It employs a linear control system that contains a power transistor and a voltage reference. To regulate the output voltage, the BD3551HFN-TR uses a feedback loop with a comparison amplifier at its heart.

In the feedback loop, the pass transistor of the output voltage and current (Vout & Iout) is first compared to the reference voltage (Vref) with an error amplifier. A signal is then generated in order to control the pass transistor\'s gain so that the output voltage conforms to the specification. An optocoupler isolates the loop from the input supply, which helps to avoid problems created by variations in the main input voltage.

To provide stable and accurate voltage control, BD3551HFN-TR has several other components to work alongside with the feedback loop, including power transistor, current-sense resistor, feedback resistor, etc. The power transistor acts as a switch to either provide a current path from the input power supply, or to dissipates the excess energy as heat. The current-sense resistor monitors the current across the pass transistor to ensure that it stays within a safe level, while the feedback resistors controls the gain of the comparison signal.

The last major component of BD3551HFN-TR that is involved in the voltage control process is the thermal switch. It monitors the temperature of the pass transistor to make sure that it does not exceed a certain level, therefore preventing it from causing a component level fault.

In conclusion, the BD3551HFN-TR is a linear voltage regulator device suitable for USB HUBs, Notebooks, Monitors and Power Supplies, and is characterized by a low-dropout voltage and wide voltage range. It employs a linear control system that includes a feedback loop, power transistor and other components, to compare the output voltage and current to the reference voltage, and adjust it accordingly. To ensure safety and stability, it also features thermal shut-off and current-sense resistors.

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