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2022-09-24 23:16:53
CS8312-Current Regulation and Dynamics of Ignition Pre-Drive IGBT
illustrate
The CS8312 is a bipolar microprocessor interface IC designed to drive IGBTs (or logic level MOSFETs) to power large inductive loads in harsh operating environments. The dynamic current limit function allows the microprocessor to adjust the current limit threshold for the real-time demand system. In the CLI, enter the current limit and set the current limit of the IGBT as high or low as an indication to the system microprocessor. CLI also cultivates and lowers the threshold for the diagnostic FLAG output signal. The FLAG output signals the microprocessor at the current level of the current limiting method of the IGBT. CTRL input enables flag functionality.
Press the CTRL switch from low to high after the CS8312 outputs (OUT) saturation voltage and supplies to the IGBT (or MOSFET) gate. If the current through the IGBT tube (MOSFET) increases, the voltage on the qualified flag is reversed through the sense resistor voltage, and the flag will turn on. If the current passing through the sense resistor continues to rise, the voltage across the resistor reaches a sense of a steady voltage, then the gate voltage drops to a certain level, adjusting the driver and maintaining the sense of voltage regulation over the sense resistor.