{634} LM339 Differential Comparator IC As Voltage & Current Protection In Computer ATX Power Supply
LM339 / UTC339, AS339M-G1 Differential Comparator IC is working as Voltage & Current Protection In Computer ATX Power Supply. how lm339 woks in atx power supply. LM339 is a differential comparator. The LM339 consist of four independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages. Operation from dual supplies also is possible, as long as the difference between the two supplies is 2 V to 36 V, and VCC is at least 1.5 V more positive than the input common-mode voltage. Current drain is independent of the supply voltage. it latches the PS-ON command, monitors Power Good PG signal. and also checks the current and voltage for over current, under voltage, over voltage. in any abnormal condition in Computer ATX Power Supply output, it disables the KA7500 or TL494 to turn off switching. if there is unbalanced load on any one output, other outputs will raise up, which will cause to turn off power supply #atx #computer #psu
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in TL494 / KA7500 based atx psu, LM339 comparator ic works as ATX supervisor ic for housekeeping and monitoring all the atx function and it turns off TL494 /KA7500 in any abnormal case (over voltage, under voltage, short circuit, over current ) it will pull up pin 4 of the TL494/KA7500 that is dead-time control pin when this pin is pulled up above 2 volt, it shutdown the ATX and disables the SMPS controller to disable it or to remove short circuit protection, it prevents the atx operation by auto shutdown from under voltage, overvoltage and overcurrent conditions. so you can modify/ Disable short circuit and overload Computer ATX Power Supply into car battery charger or lab power supply for your electronics workbench or you can make it variable dc power supply. How To Disable Voltage & Current Protection from ATX PSU / computer power supply.
computer / pc / server / atx psu hack to make adjustable variable bench power supply to make 12v power supply. it can be used as workbench power supply or battery charger.
How to Modify/ Disable short circuit and overcurrent overload protection in ATX power.
To modify atx power supply to make bench power supply / battery charger using this atx power supply we can adjust voltage to 13.4v to charge 12v car battery or it can be modified as lab bench power supply.
when we repair computer atx power supply, if there is any fault in the power supply, it will turn off immediately after turn off the pwm controller to protect the computer and power supply circuit. adjustable power supply can be prepared by disabling the protection, computer power supply is not working, how to repair atx psu switch mode power supply, computer power supply works, atx power supply repair,
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