L78L06ACUTR

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L78L06ACUTR (low dropout 6V Positive Voltage Regulators) is an integrated linear regulator with undervoltage lockout and protection circuit, which makes it well suited for current sensitive applications. It has a wide range of applications, from automotive to industrial and consumer electronics. In this article, we will discuss the application fields and the working principle of this device.

Application Fields

The L78L06ACUTR is suitable for a wide range of applications, from automotive to industrial and consumer electronics. It can be used as:

• Low-Dropout Voltage Regulators for Mobile Communication Equipment
• Voltage Regulators for Automotive Electronics
• Voltage Regulators for Industrial Electronics
• Voltage Regulators for Consumer Electronics
• Alternative Voltage Regulators for MCU, DSP and FPGA Power Source

In addition, due to its adjustable output voltage, the L78L06ACUTR is also a suitable device for 3V, 5V and 9V conversion.

Working Principle

The L78L06ACUTR integrated linear regulator is mainly composed of an pass element, a internal power N-Channel MOSFET, a comparator and an internal undervoltage lockout (UVLO) circuit. It also has an internal reference voltage source, allowing the device to provide constant output voltage even under varying input voltage.

The basic operation of the device is as follows:

• The Voltage Error Amplifier (VEA) of the device checks the output voltage to ensure it is equal to the reference voltage set by the user. The reference voltage is typically set with a voltage divider.
• If the output voltage is not equal to the reference voltage, a correction signal is sent to the Gate of the external pass element.
• The correction signal will cause the Gate voltage of the external pass element to adjust, thus making the output current flow through the external pass element.
• The output current then flows through the load and the internal power MOSFET.
• This will cause the output voltage of the device to be equal to the reference voltage, thus maintaining a constant output voltage.

The L78L06ACUTR also includes an undervoltage lockout (UVLO) circuit. This circuit monitors the input voltage of the device and shuts down the pass element if the input voltage drops below the set minimum threshold. This provides protection to the device and ensures a stable output voltage.

In addition, the device has a thermal shutdown (TSD) function. If the temperature of the device reaches a certain threshold, the thermal shutdown will be activated. This will shut down the pass element and will protect the device from damage or malfunction caused by excessive heat.

Conclusion

The L78L06ACUTR is an integrated linear regulator with undervoltage lockout and thermal protection. It is suitable for applications such as power conversion for MCU, DSP and FPGA, automotive electronics and consumer electronics. The device operates by using an external pass element, a Voltage Error Amplifier, an internal power MOSFET, a comparator and an internal undervoltage lockout circuit. This device is an ideal choice for power regulators and is widely used in various industrial and consumer electronics applications.

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