IRU1117CSTR

IRU1117CSTR Application Field and Working Principle

The IRU1117CSTR is a high accuracy, low noise and wide operating temperature range positive voltage regulator. It can be configured and combined in different ways. Depending on the application, the IRU can be used as a low current voltage regulator or as a medium current power supply. It is designed to provide cost efficient and steady solutions in a variety of applications like automotive, industrial, and consumer.

Design

The design of the IRU1117CSTR integrates numerous functions for a small volume size. The core device is an LM1117-3V3, which is a monolithic linear voltage regulator offering excellent output voltage accuracy, low noise performance, high power supply rejection ratio, and a wide operating temperature range . The chip is surrounded by other components such as inductors, capacitors, ferrites, and resistors.

Application Fields

The IRU1117CSTR can be applied in various fields where low voltage and noise sensitivity are crucial, such as automotive or industrial. Automotive uses include car audio systems, engine control modules, navigation systems, and instrument clusters. In industrial applications, the IRU1117CSTR can be used for PLCs (programmable logic controllers), UPS (uninterruptible power supply) systems, and power amplifiers.

Working Principle

The working principle of the IRU1117CSTR is based on the standard voltage regulator topology. It consists of an input capacitor and a series of resistors and inductors. Together they form a low pass filter, which reduces the voltage ripple from the input voltage. The input voltage is then reduced by a resistor divider. This is followed by a pair of phase compensation capacitors, which stabilize the output voltage. Finally, the regulator is fed into the LM1117-3V3 to produce a steady output voltage.

The IRU1117CSTR works in three stages. First, the input voltage is filtered using a low pass filter, then it is multiplied with a resistor divider, and finally regulated using the LM1117 voltage regulator. Of these, the most important function is that of the voltage regulator. It maintains a constant output voltage regardless of the variations in the input. It does this by comparing the output voltage to a reference voltage and then adjusting the output voltage accordingly. This ensures a steady output voltage.

Conclusion

The IRU1117CSTR is a high accuracy, low noise, and wide operating temperature range voltage regulator that can be used in a variety of applications. It is designed to provide cost efficient and steady solutions in automotive, industrial, and consumer applications. It works by filtering the input voltage, reducing it through a resistor divider, and finally regulating it with the LM1117 voltage regulator. This ensures a steady output voltage regardless of the variations in the input.