L78L09ACZ-TR Integrated Circuits (ICs)

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The L78L09ACZ-TR is a three terminal negative linear regulator from STMicroelectronics. It is designed to provide a fixed negative voltage. It is housed in a TO-92 package and is available in ACZ version.

Application Field

The L78L09ACZ-TR is suitable for a wide range of applications. It can be used in portable equipment, hand held devices, audio systems and portable medical devices. Other applications include alarms and warning systems, test equipment and automotive systems.

The L78L09ACZ-TR is also suitable for providing a negative voltage source in power supplies, where a voltage reference is needed. It is also suitable for powering low voltage circuits, as it can provide a regulated negative voltage.

Working Principle

The L78L09ACZ-TR is a three terminal linear regulator. It is a negative voltage regulator and provides a regulated output voltage of -9V with a load current up to 100mA. It has a low dropout voltage of 2V and is rated to an operating temperature range of -40° to 125°C.

The working principle of a linear regulator is based on creating a small potential difference between the input and output of the regulator. The maximum output current of the regulator is limited by the load resistance connected to the output, which also determines the efficiency of the regulator.

The L78L09ACZ-TR uses an internal pass transistor to control the amount of current drawn from the regulator output. When the input voltage exceeds a certain threshold, the pass transistor is turned on and the output voltage is regulated. The setting of the voltage is determined by the voltage applied to the control terminal of the regulator.

The L78L09ACZ-TR also has an internal current limiting circuit, which prevents the device from drawing excessive current from the voltage source. This will protect the device from over current faults and will help to ensure correct operation of the regulator.

Conclusion

The L78L09ACZ-TR from STMicroelectronics is a three terminal negative linear regulator. It is designed for applications requiring a fixed negative voltage and is suitable for use in power supplies. It has a low dropout voltage and is rated to an operating temperature range of -40° to 125°C. It is also protected by an internal current limiting circuit, which prevents it from drawing excessive current from the voltage source.

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