APPARATUS FOR CHECKING CONSTANT VOLTAGE OUTPUT OF SWITCHING-TYPE POWER SUPPLY

摘要

PURPOSE: An apparatus for checking a constant voltage output of a switching-type power supply is provided to improve the stability of voltage supply by monitoring a constant voltage of the switching-type power supply. CONSTITUTION: A check point(CHECK POINT) is an output node of an output voltage(5V). A voltage divided into voltages of a resister(Rx) and a resister(Ry) from the output voltage(5V) is inputted to a positive(+) terminal of a comparator(COMPARATOR). A voltage from a power +12V is inputted to a negative(-) terminal of the comparator(COMPARATOR) through a node of a Zener diode(D4) connected to a resister(R3). A switching-type power supply has the output voltage(5V). A dividing unit divides the output voltage(5V) of the switching-type power supply. The comparator(COMPARATOR) compares a divided voltage of the dividing unit to a reference voltage to output a power state of the switching-type power supply.