L78S09CV

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The L78S09CV is an integrated linear voltage regulator designed for a wide range of applications. It offers an excellent solution for cost-saving, space-saving and power-saving in power switching and control circuits. The L78S09CV integrated circuit comprises three series modes of operation which include a current-limiting, adjustable voltage-limiting and thermal-shutdown mode of operation. Additionally, the L78S09CV integrates a low on-voltage drop voltage regulator capable of sourcing up to 750mA with an adjustable output voltage ranging from 1.235V and up to 37V.

The L78S09CV integrated linear voltage regulator can provide a fixed output voltage with just one resistor and is particularly suitable for applications where space is limited. Its internal structure includes a built-in series pass regulator and reverse-sourced protection to protect against input power reversal, over-current, and short-circuit. The L78S09CV is also designed with a thermal protection shutdown to prevent the device from overheating.

The L78S09CV uses a pass element in its linear voltage regulator. The pass element is designed to permit a current to flow through it and it controls the flow of current by adjusting the voltage at the output of the device. The device operates by sensing the voltage at the output and adjusting the pass element based on the sensed value. The pass element is connected between the regulated output and ground and is responsible for regulating the output current depending on the voltage drop across the pass element.

The working principle of the L78S09CV can be split into three stages. Firstly, the pass element senses the output voltage of the device. Secondly, it controls the current flow through the pass element based on the output voltage. Finally, the output voltage is adjusted to its required level. In this way, the L78S09CV is able to regulate the output voltage and current. The L78S09CV also has an additional input for an external current limiting element which can be used to adjust the maximum output current.

In conclusion, the L78S09CV integrated linear voltage regulator is a simple and cost-effective switch-mode power supply solution. It can be used in a wide range of applications, such as automotive systems, battery chargers, power supplies, Ethernet switches and DC to DC converters. The device has excellent current-limiting, adjustable voltage-limiting and thermal-shutdown operation modes to protect it and the connected circuitry. The device is also designed with a low on-voltage drop voltage regulator capable of sourcing up to 750mA. Finally, its pass element-based design allows for the adjustment of the output current and the protection of the device from input power reversal, over-current and short-circuit.

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