ZXRE125DR

Voltage reference devices are used to provide a precise reference voltage that can be used as a reference for regulating voltages in power supply systems. The device typically consists of an internal voltage regulator, external feedback components, and an output voltage buffer. The ZXRE125DR voltage reference device is a closed loop regulator with built-in error amplifier, primary pass device and reference voltage. The device provides a stable, error free output when supplied with a controlled current or voltage.

Applications

The ZXRE125DR voltage reference device is commonly used in power supplies, switched mode power supplies (SMPS), micro processors, clocks and various other circuits. It can be used for reference voltage for low power circuits,reference voltage for low dropout (LDO) regulators, reference voltage for operational amplifiers, reference voltage for feedback circuits, adjustable output current and voltage for SMPS, and negative voltage generators.

Working Principle

The ZXRE125DR voltage reference device works in the following way. It consists of a controlled current source that produces a constant voltage output. This voltage is fed into the internal error amplifier, which compares the actual output voltage with the reference voltage and adjusts the internal pass device accordingly. This adjusted output voltage is then fed to the output buffer which provides the output voltage regulation.

The error amplifier is used to control the internal pass device, by varying its operating parameters, to keep the output voltage within the specified limits. This is the ‘closed loop’, which means the output voltage is regulated relative to the reference voltage, ensuring a stable output voltage over a wide range of supply voltages and output loads.

The ZXRE125DR voltage reference device is designed to operate over a wide temperature range. It has over-temperature protection and reverse-bias protection. This ensures the device is more reliable and offers enhanced performance. Additionally, the device has high immunity to EMI, which eliminates any interference from external sources.

Conclusion

The ZXRE125DR voltage reference device is a reliable and a very useful device for regulating voltages in power supply systems. It works by using a closed loop which ensures that the output voltage is maintained with respect to the reference voltage. Additionally, the device has over-temperature protection and reverse-bias protection, making it more reliable and enhancing its performance. It is also highly immune to EMI, ensuring that it is not affected by external sources.