LT1009IDG4

The LT1009IDG4 is a voltage reference device, specifically a precision low-temperature-coefficient shunt regulator. It is ideal for systems that require a stable adjustable supply current or a stable and adjustable settling voltage under varying temperature conditions.

Application Field

The LT1009IDG4 is utilized in a variety of applications including:

• Power supply regulation - the LT1009IDG4 can be used to provide an adjustable voltage from a constant current source or from a regulated power supply.
• Industrial automation - the LT1009IDG4 can be used to provide accurate voltage and current control for automated processes requiring precise parameters.
• Medical equipment - the LT1009IDG4 is used to provide stable and accurate voltage and current regulation for medical equipment used in hospitals or other medical facilities.
• Outdoor lighting - the LT1009IDG4 can be used to provide stable and reliable voltage and current regulation for outdoor lighting systems.
• Optical timing systems - the LT1009IDG4 is used in optical timing systems to precisely control the timing of laser light sources.

Working Principle

The LT1009IDG4 has a very low temperature coefficient, which helps to ensure a stable output voltage over a wide range of temperatures. The device has two major components, the current-sensing circuit, and the voltage reference circuit.

The current-sensing circuit is used to measure the current flowing through its terminal. It is made up of a sense resistor and a current feedback amplifier, which is used to amplify the sense resistor’s signal. This signal is then compared to a precision reference voltage, which is generated by the voltage reference circuit.

This reference voltage is used to determine the amount of current flowing through the LT1009IDG4. If the sensed current exceeds the reference voltage, the circuit will reduce the current until the sensed current matches the reference voltage. This process continues until the circuit reaches a steady-state condition where the current is equal to the reference voltage.

The LT1009IDG4 can also be used to regulate an adjustable voltage when connected to a regulated power supply. The voltage reference circuit is connected to the regulated output of the power supply to set the desired output voltage. The current-sensing circuit is used to measure the current flowing through it. Once the desired voltage is set, the LT1009IDG4 will adjust the current to maintain the desired voltage.

Conclusion

The LT1009IDG4 is a precision low-temperature-coefficient shunt regulator which is ideal for systems requiring a stable adjustable supply current or a stable and adjustable settling voltage under varying temperature conditions. The device’s current-sensing circuit is used to measure the current flowing through it and its voltage reference circuit is used to set the desired output voltage.