L7985A

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The L7985A is a 3-terminal, low power DC-DC Step Up regulator, specialized for automotive applications. It features a voltage-variable pulse-width modulation control system that allows it to produce up to 45mA output current with very low quiescent current. The device is designed to operate in either step-up or step-down applications to help boost or regulate the voltage supplied to automotive circuits. It is also capable of providing a regulated voltage across a wide range of operating conditions with little need for external components.

The most basic application of the L7985A is as a low power DC-DC step up regulator. Its main function is to take an input voltage (of no more than 3.3V) and convert it to a higher output voltage (of up to 12V). This can be done by changing the pulse-width modulation duty cycle, which is adjustable using either a voltage or a control signal. The step up converter is then able to provide a regulated output voltage that is stable over a wide range of load and environmental conditions.

The device is also capable of operating as a DC-DC step down regulator. In this configuration, the device takes an input voltage of up to 45V and steps it down to a regulated 5V output. This allows it to be used to supply power to low voltage devices such as microcontrollers, FPGAs, and other logic circuits. The device has a current-mode control system that provides fast transient response times with excellent line and load regulation.

The working principle of the L7985A is based on Proportional-Integral-Derivative (PID) control. The device measures the input and output voltages and then adjusts the pulse-width of the output signal accordingly. The amount of adjustment is proportional to the difference between the input and output voltages – the higher the difference, the wider the pulse-width. This allows the device to maintain a regulated output voltage over a wide range of load and environmental conditions.

In addition to its step up and step down operations, the L7985A can also be used as a constant current source. By using a resistor divider to detect the output voltage, the device can be used as a low power, low voltage, constant current source. This is particularly useful for supplying power to low level logic circuits, such as microcontrollers, as it eliminates the need for a complex power supply circuit. The device can be used with a wide range of input and output voltages to provide a regulated current source.

The L7985A is an ideal solution for low power DC-DC step up and step down requirements in automotive applications. Its voltage-variable pulse-width modulation control system allows it to provide a regulated output voltage over a wide range of operating conditions with little need for external components. Its current-mode control system also provides excellent line and load regulation, making it an ideal choice for supplying power to low voltage, low level logic circuits. With its wide range of features and capabilities, the L7985A is an excellent choice for any automotive design requiring low power DC-DC conversion.

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