The circuit shown in Figures 98-1 and 98-2 is a regulator spreading circuit that uses MOSFET tubes to increase the output current of an IC regulator. This design incorporates a current mirror and a power MOS transistor, allowing the system to deliver higher current while maintaining all the built-in protection features of the IC regulator. Additionally, it provides effective protection for the MOSFET, ensuring stable operation under various load conditions. Compared to a standard IC regulator without external components, this configuration offers improved performance. For example, when the load current increases to 10A, the output voltage only rises by about 0.1V, which is significantly better than the typical drop seen in a standalone IC regulator. This makes the circuit ideal for applications requiring high current delivery with minimal voltage loss. In this setup, R1 and R2 are current-sensing resistors. The current flowing through the IC regulator passes through R1, while the current through the MOSFET flows through R2. An operational amplifier (op-amp) controls the on-resistance of the MOSFET, adjusting it so that the voltage drop across R1 matches the voltage drop across R2. This ensures that the current through the MOSFET is proportionally reflected at the IC regulator based on the ratio of R1 to R2. One key advantage of this design is that the op-amp can operate with its input common-mode voltage equal to its supply voltage. This allows the circuit to sense current even during power-up or when the system is in a low-voltage state. Furthermore, the high gain of the op-amp enables the use of small resistance values for R1 and R2, resulting in a lower voltage drop across the regulator and improved efficiency.
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