XC6122A747ER-G

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The XC6122A747ER-G is a low-voltage supervisory circuit (VSC) in the XC6122A series specifically designed for automotive applications. It is specially designed for personal automobile systems such as large motorcycles, buses and trucks, which require a high stability and safety level. This device has multiple protection functions such as load reset, reset signal output and reset delay time setting. It also integrates an internal voltage monitoring circuit, a power supply and an output short circuit protection circuit. The XC6122A747ER-G is suitable for 12V(max) automotive power supplies, providing an industry-leading power reset threshold accuracy of +/-1%.

Applications:

• Power supplies for vehicles
• Vehicle control systems
• Airbag systems
• Motor control systems
• Power supply circuits

Working Principle:

The XC6122A747ER-G is an ideal device for power-supply-related circuit resets and monitoring. It is a three-terminal voltage supervisor that monitors an input voltage (VIN) and generates an output reset signal (RST) when VIN drops below the reset threshold voltage (VTH). Plus, it has an additional function that is to prevent unwanted reset signals during power-on surge. This is achieved by delaying the output after power-on for a certain amount of time unless VIN drops below VTH. The XC6122A747ER-G also features input voltage sensing and output voltage limiting for improved system performance. When the input voltage is too high, the voltage limiting circuit limits the output voltage to a preset value. This prevents the output from exceeding the maximum allowed level. It also includes an over-voltage reset (OVR) function that resets the system when the input voltage rises above a preset threshold.

The XC6122A747ER-G has an internal power supply circuit that maintains an internal voltage source VDD. It will be powered up as soon as the input voltage VIN is higher than the VDD voltage. The internal voltage VDD is used to operate the internal circuits such as the reference voltage, comparator, delay timer and output driver. The output driver drives the reset signal RST and the reset delay time is determined by the external capacitor connected to the external pin CD. When VIN drops below the reset threshold VTH, RST is immediately activated and the system is reset. After reset is released, the external capacitor CD charges VDD to the reset threshold voltage VTH. The XC6122A747ER-G also features an input current sense protection circuit to protect the device when the input current is too high. The detection level is adjustable by the external capacitor connected to CT pin.

In short, the XC6122A747ER-G is a highly reliable, low-power device that is suitable for applications requiring high-precision resetting and power supply monitoring. It integrates multiple protection functions and provides high accuracy and stable performance in automotive applications.

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