Which of the following statements is/are NOT correct regarding an IC 723?
S1: The output voltage ranges from 2 to 37 volts.
S2: The output current is up to 150 mA.

Explanation:

To determine the correctness of the given statements about the IC 723 voltage regulator, we need to understand the specifications and characteristics of the IC 723.

IC 723 Overview:

The IC 723 is a versatile voltage regulator IC used for both positive and negative voltage regulation. It can operate over a wide range of input voltages and can be configured for different output voltage ranges and current outputs. The IC 723 is known for its reliability and flexibility in various power supply designs.

Specifications of IC 723:

• Output Voltage Range: The IC 723 can be configured to provide an output voltage range from 2 volts to 37 volts. This is achieved by adjusting the external components connected to the IC, such as resistors and capacitors.
• Output Current: The IC 723 can deliver an output current of up to 150 mA when used in its basic configuration. However, with the addition of an external pass transistor, the output current can be increased significantly, depending on the specifications of the external transistor.

Analysis of Statements:

• S1: The output voltage ranges from 2 to 37 volts.
• S2: The output current is up to 150 mA.

Based on the specifications of the IC 723, we can analyze the correctness of the statements:

• S1: This statement is correct because the IC 723 can indeed provide an output voltage range from 2 to 37 volts by adjusting the external components.
• S2: This statement is also correct because the IC 723 can deliver an output current of up to 150 mA in its basic configuration. The output current can be increased with the use of an external pass transistor, but the statement specifies the basic configuration.

Conclusion:

Since both statements S1 and S2 are correct, the correct answer is option 1, which states that neither S1 nor S2 is incorrect.

Important Information:

The IC 723 is highly versatile and can be used in various voltage regulation applications. Here are some additional points to consider:

• The IC 723 includes an internal reference voltage source, error amplifier, series pass transistor, and a current limiting circuit.
• It can be used to design both linear and switching regulators.
• The output voltage can be adjusted using external resistors connected to the voltage adjustment pins of the IC.
• The IC 723 can operate with input voltages up to 40 volts, making it suitable for a wide range of power supply designs.
• For higher current applications, an external pass transistor can be added to boost the output current capability of the IC.
• Thermal protection and current limiting features enhance the reliability and safety of the IC 723 in various applications.

In conclusion, the IC 723 is a reliable and flexible voltage regulator IC suitable for a wide range of applications, offering an output voltage range of 2 to 37 volts and an output current of up to 150 mA in its basic configuration. Both statements S1 and S2 are correct, making option 1 the correct choice.