FDS8870

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FDS8870 is a High-Side Power Switch which is manufactured by Fairchild Semiconductor. It is a type of MOSFET that is designed for providing higher level of robustness, reliability and stability for a variety of applications including automotive, medical, industrial and consumer applications. In general, FDS8870 is a discrete MOSFET-based power switch which comprises of a source-gate voltage protection system, temperature protection and avalanche energy sense. It is designed to provide a switchable current path for DC voltages up to 65 V and total output current up to 6 A.

The FDS8870 is suitable for a variety of motor applications, such as window lifts, heater and cooling system controls, seat heat and adjustable mirror modules, fan controls and other potential applications that require controlling high side current paths. It is also suitable for driving high current loads in applications like DC motors and solenoid actuators with the help of a small and low cost microcontroller. This makes the FDS8870 an ideal choice for cost and space-sensitive systems. Additionally, its low power consumption, low standby current, low on- resistance and high off-state current makes it a versatile and highly efficient solution.

FDS8870 includes a number of features which make it an attractive choice for high-side power switch applications. It has a low on-resistance typical value of 19mΩ and a high off-state current density up to 60A/mm2. The device also incorporates a built-in thermal shutdown protection circuitry, which terminates the current path if the junction temperature reaches a certain limit. This feature ensures safe operation of the power switch by preventing heat-related problems. In addition, FDS8870 features a programmable current limit, which provides a built-in protection against overload and short circuit conditions. Its voltage sense feature also helps to minimize power dissipation when the device is in its off state.

The working principle of FDS8870 is based on the principle of MOSFETs. MOSFETs have an insulated gate terminal, around which a conductive channel of electrons is created. The state of this channel is determined by the voltage applied across the source and gate terminals of the MOSFET. When the voltage applied across the gate and source terminals is higher than the threshold voltage of the device, the conduction channel is activated and the device switches in its “on” state. When the voltage applied across the source and gate terminals is lower than the threshold voltage, the MOSFET is in its “off” state.

To control the operation of the FDS8870, an external microcontroller is used. The controller is connected to the gate terminal of the FDS8870 through an interface circuit, which translates the digital signals of the microcontroller into voltage signals that can be used to control the FDS8870. The microcontroller can either activate the switch or de-activate it depending on the digital signals it receives. It can also vary the ON-time and OFF-Time delays to control the speed of the switch depending on the application at hand. This allows the user to control the switching times of the device and consequently increase or decrease the current limit in order to control the total current in the system.

In summary, the FDS8870 is a highly reliable and efficient MOSFET-based high-side power switch which incorporates a number of built-in safety features like thermal and avalanche energy protection, voltage sense and programmable current limit. It is a versatile solution for reliable motor and power control applications with low power consumption, low standby current and high off-state current density. The working principle of FDS8870 is based on the principle of MOSFETs, which uses an insulated gate terminal and an external microcontroller to control the operation of the device. The microcontroller is responsible for controlling the switch according to the digital signals received by it, allowing the user to control the switching times of the device and vary the current limit accordingly.

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