S7822BA Uncategorized

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The S7822BA Omnipolar Hall-effect Switch is designed to provide versatile and accurate switching for applications requiring contactless current sensing solutions. Developed using CMOS ASIC technology, this Hall-effect switch combines low power consumption and a wide operating voltage window with high accuracy at all temperature ranges. A variety of features, such as an open drain output and adjustable hysteresis, make it ideal in applications requiring contactless solutions.

The S7822BA is a high-precision, open-drain Hall-effect switch with eight integrated output drivers. The device has an operating voltage range from 2.7 V to 17 V, with a threshold voltage range from 375 mV to 1.7 V at 25°C. The minimum detection current of the switch is typically 2 mA (2 mV peak-to-valley ripple). The switch offers a high current strength output of 250 mA and a maximum voltage of 15 V. The hysteresis of the switch can be adjusted using an external resistor. The output of the switch is opened drain (open drain output), meaning the load current is limited by the current sinking capability of the external circuit.

The S7822BA Hall-effect switch is suitable for applications like current sensing, electric motor commutation, position sensing, overcurrent protection, and overvoltage protection. The current sensing application is one of the most important applications of the S7822BA; it provides a contactless solution for non-intrusive current sensing. The open drain output helps limit the current to a safe and reliable level, and the adjustable hysteresis allows adjustment of the output switch-on/off threshold voltage window. The Hall-effect switch is also used in motor commutation applications, where it can be used to detect the position of the rotor in an electric motor to control the load current flows.

The working principle of the S7822BA Hall-effect switch is the same as any other Hall-effect device. It consists of a semiconductor material sandwiched between two electrical current carrying components. When an external magnetic field is applied to the semiconductor material, it causes a Voltage to be generated in the material. This Voltage is proportional to the strength and polarity of the applied magnetic field. The generated Voltage acts as an input signal to the Hall-effect device. The internal circuitry of the Hall-effect device amplifies the applied signal, and regulates the output Voltage or current as per the applied magnetic field.

The S7822BA Hall-effect switch is a contactless current sensor, suitable for a wide range of applications. Its open-drain output helps limit the current to a safe and reliable level, and the adjustable hysteresis allows fine tuning of the output switch-on/off threshold voltage window. Its features make it ideal for use in current sensing, motor commutation, position sensing, overcurrent protection, and overvoltage protection applications.

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