Short Circuit Protector For 78xx
Short circuit protector is a series of standard short circuit protector of positive voltage regulator 78xx. Variations in short circuit protection circuit is a series 78xx obtained from regulator 78xx datasheet. Short circuit protector circuit is to use RSC as the current sensor. Configuring short circuit protection in this circuit configuration built by 2 pieces of PNP transistor and the resistor RSC. The complete series can be seen in the figure below.
Circuit Of Short Circuit Protector For 78xx
Power regulator circuit uses PNP MJ2955 transistor because the transistor drain current is expected to be able to fit current maximum that will be assessed as a short circuit by the RSC. To set the maximum allowable current limit can be done by adjusting the resistance value corresponding formulations in the datasheet RSC 78xx regulators.