Power-LDO Regulator with TL431 and P-Mosfet

The Power-LDO regulator is a type of linear voltage regulator that can regulate voltages above 5V. It uses the Temperature-Sensitive Resistor (TSR) to sense the input voltage and output voltage, and the Linear Voltage Regulator (LVR) to control the output voltage. The TSR senses the input voltage and generates a signal proportional to the input voltage. The LVR then compares this signal with the desired output voltage and adjusts its current to maintain the desired output voltage.

The TL431 is a popular choice for the TSR because it has a wide range of operating points and a low power consumption. The P-Mosfet is used as the switching device for the LVR, which provides high switching speed and low on-resistance. The P-Mosfet is also suitable for high-current applications and can handle both positive and negative supply voltages.

This type of Power-LDO regulator is particularly useful for protecting USB connectors from overvoltages. Overvoltages can occur due to various reasons such as short circuits or misconnections in the USB connectors. The TL431 ensures that the input voltage remains within a safe range by comparing it with the desired output voltage. The P-Mosfet ensures that the output voltage is maintained at the desired level even during transient events.Power-LDO to regulate voltages above +5V protecting overvoltages going into USB-connectors