In the case of overvoltage protection, a comparator independent of the voltage monitor (sense amplifier) and voltage regulator monitors the voltage applied to the load connection terminals and compares them with the set response value, which in turn is generated by a separate D / A converter with its own reference voltage.
If the output voltage exceeds the threshold value, an OUTPUT ON OFF process is triggered via the processor (with temporary activation of the sink function to quickly discharge the output capacitor) and, in addition, the clock for the power transformer is blocked in terms of hardware so that no further energy transfer is possible.
By means of OUTPUT OFF ON, the overvoltage protection is reset and the output is reactivated. The response time of the overvoltage protection is adjustable, but is minimal up to 200μs.
If the overvoltage protection is set correctly, it protects connected devices from excessive voltage caused by: