L7912ACV-DG

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The L7912ACV-DG is a two-terminal, adjustable, positive voltage regulator featuring exceptional current limiting, thermal shut down and an output voltage adjustable from 1.2V to 37V. It has been designed to simplify the implementation of positive voltage regulation circuits, thereby reducing circuit cost, board space, and time to market.

The L7912ACV-DG is used primarily in the fields of telecommunications, industrial instrumentation and computer systems. It is commonly used to regulate the output of power supplies, stabilize the input voltage to digital logic circuits, and convert domestic 240V AC to a 3V DC output. It is also used as a voltage regulator in DC/DC converters, mobile phone chargers and UPS systems. The L7912ACV-DG is particularly suited for high-current, high-dropout applications.

The working principle of the L7912ACV-DG is based on an internal linear regulator. It monitors the output voltage and compares it to a reference voltage. Any discrepancy between these voltages results in an error signal, which is amplified and applied to the internal transistors, thereby regulating the output voltage level. The regulator has two voltage levels, a high voltage level and a low voltage level, and the output voltage is maintained between these two levels. The high level is set by a resistor connected to the output, while the low level is adjustable via an external potentiometer.

The output current is limited to a predetermined level by output current limiting circuitry, which senses the presence of excessive output current and immediately begins to reduce the output voltage, thereby preventing damage to the regulator and associated circuitry.

The L7912ACV-DG also features thermal protection circuitry, which senses the temperature of the regulator and shuts down the output when it reaches an unsafe level. This circuit is designed to protect the device from damage due to excessive temperatures.

In addition, the L7912ACV-DG has a power save feature, which reduces the quiescent current drawn from the input voltage by switching off the output for a predetermined period of time. This feature is useful for applications where power consumption is critical, such as in battery-powered devices.

Overall, the L7912ACV-DG is an excellent voltage regulator for a wide range of applications, enabling users to easily and quickly implement voltage regulation circuits with outstanding performance. Its features make it an ideal choice for high-current, high-dropout applications, while the adjustable output voltage and power-saving features make it perfectly suited for mobile electronics applications.

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