FIELD: physics.
SUBSTANCE: invention relates to a technology for switching power supply and can be used to optimise the input voltage range of an IC chip. In the circuit for optimising the input voltage range of an IC chip, a pull-up unit receives an input voltage and then outputs a corresponding voltage level; a trigger unit compares the voltage level output by the pull-up unit with a given threshold voltage, and outputs an enabling signal of corresponding level to an enabling end of the IC chip based on the comparison result, so as to control the IC chip to start/stop; and a voltage stabilising unit receives the voltage levels output by the pull-up unit and the trigger unit, and then outputs a voltage of corresponding level to the pull-up unit based on the voltage levels output by the pull-up unit and the trigger unit, so that the voltage level output by the pull-up unit is higher than or equal to the threshold voltage and thereby the IC chip starts operation, or so that the voltage level output by the pull-up unit is maintained to be higher than or equal to the threshold voltage and thereby the operation of the IC chip is not affected by variations of the input voltage.
EFFECT: technical result is the provision of continuous operation of the IC in normal mode when the input voltage varies within certain limits.
4 cl, 2 dwg
