LM7912CT Integrated Circuits (ICs)

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LM7912CT is an adjustable three terminal negative voltage regulator. It is notable for its ability to easily supply current up to 1Amp with an output voltage range of -1.2V to -37V. This regulator has a temperature coefficient of 2mV/°C and has good power handling capability up to 6W. LM7912CT regulators have many applications in power management, such as DC-DC converters, lighting systems, automotive applications, and several industrial and consumer product designs.

The LM7912CT series regulator has various features designed to improve its performance and reliability, such as:

• High Impedance Input
• Low Ripple Rejection
• High Output Voltage Accuracy
• Good Load and Line Regulation
• Low Temperature Coefficient
• Low Power Dissipation

The LM7912CT series regulator has a two-mode control circuitry that enables it to provide extremely accurate and stable output voltage with very low dropout voltage. The first mode is called the shut-down mode and is used when the device is not in use. The second mode is called the active mode and is used when the device is supplying current to the output. In active mode, the device operates as an adjustable three-terminal negative regulator with current limited features.

The working principle of LM7912CT is simple and straightforward. The negative regulator consists of a voltage-controlled power transistor, a power transistor protection circuit, an adjustable reference, a reference compensation capacitor, and an output control resistor. The voltage-controlled power transistor control the flow of current within the circuit. The reference in the circuit is used to vary the output voltage by adjusting its output Constant Voltage Drop (CVD). When the input signal voltage (Vin) is greater than the reference voltage, the power transistor opens allowing current flow in the circuit. When the input voltage is less than the reference voltage, the power transistor closes, stopping current flow.

The protection circuitry on the LM7912CT prevents the power transistor from drawing too much current, it also protects the device against short circuiting and thermal runaway. This feature is especially important for consumer products where safety is an important consideration. The output control resistor is used to trim the output voltage, allowing it to be set at the desired voltage level.

The LM7912CT regulator has many applications, such as powering circuits in mobile devices, computer systems, and various other consumer products. It can also be used for power management in industrial and automotive systems for controlling the output of motors and other devices.

In conclusion, LM7912CT is a versatile, adjustable three-terminal negative voltage regulator with many features that make it suitable for a wide range of applications. It has a temperature coefficient of 2mV/°C and high power handling capability up to 6W. It can provide extremely accurate and stable output voltage with low dropout voltage and excellent load and line regulation. The protection circuitry on the LM7912CT prevents the device from drawing too much current, it also protects the device against short circuiting and thermal runaway. This makes it an ideal choice for many applications.

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