R1525x NO. EC-520-190109 THEORY OF OPERATION Thermal Shutdown When the junction temperature of this device exceeds 160°C (Typ.), the built-in thermal shutdown circuit stops the regulator operation. After that, when the temperature drops to 135°C (Typ.) or lower, the regulator restarts the operation. Unless eliminating the overheating problem, the regulator turns on and off repeatedly and a pulse shaped output voltage occurs as result. APPLICATION INFORMATIONTypical Applications VDD VOUT VOUT CIN R1525x COUT CE GND CE Control CIN = Ceramic 0.1 µF COUT = Ceramic 0.1 µF R1525x Typical ApplicationsTypical Application for IC Chip Breakdown Prevention When a sudden surge of electrical current travels along the VOUT pin and GND due to a short-circuit, electrical resonance of a circuit involving an output capacitor and a short circuit inductor generates a negative voltage and may damage the device or the load devices. Connecting a schottky diode (D1) between the VOUT pin and GND has the effect of preventing damage to them. VDD VOUT VOUT CIN R1525x COUT D1 CE GND CE Control CIN = Ceramic 0.1 µF COUT = Ceramic 0.1 µF R1525x Typical Application for IC Chip Breakdown Prevention 10
