Voltage reduction conversion circuit achieving adjustable voltage

Abstract

The invention relates to the field of development of circuit boards and discloses a voltage reduction conversion circuit achieving adjustable voltage. According to the voltage reduction conversion circuit achieving adjustable voltage, by adjusting an adjustable resistor RX1 of a resistor-adjustable unit, the output voltage of a voltage reduction conversion chip is changed, and therefore stable output of different target voltages can be achieved, the voltage reduction conversion circuit achieving the adjustable voltage has higher practicability, development and debugging of a circuit board are facilitated, fine adjustment of output voltage can also be achieved, and it is avoided that the chip works under an overvoltage state or an undervoltage state.

Description

technical field [0001] The invention relates to the field of circuit board development, in particular to a voltage-adjustable step-down conversion circuit. Background technique [0002] A circuit board, also known as a printed circuit board, is an integrated board that combines multiple chips or devices to achieve target functions. There are many different types of chips involved on the circuit board, and their power supply voltages may be different, but for the interface of the circuit board, there is only one commonly used input voltage source (such as an external 5V or 12V voltage source), in order to make each chip work normally. To work, it is necessary to design a step-down conversion circuit to realize local step-down to drive the chip to work normally. For example, the working voltage of the FPGA (Field-Programmable Gate Array, Field Programmable Gate Array) chip is 3.3V, and a step-down conversion circuit is required to reduce the external 5V voltage to 3.3V to dri...

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Problems solved by technology

[0003] Since the device parameters of the current step-down conversion circuit are fixed, a step-down conversion circuit can only step down to a fixed target value. However, in the process of development and debugging, it is often necessary to replace chips with different operating voltages. The current step-down conversion circuit The circuit will no longer be practical and needs to be redesigned, which will bring inconvenience to the development work. At the same time, because the device parameters in the step-down conversion circuit are all fixed values, it is often impossible to accurately achieve the specified target and cannot be fine-tuned. pressure state or overvoltage state

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