Explanation: The switching element dissipates negligible power in either on or off state. Therefore, the switching regulator is more efficient than the linear regulators. 6. State the reason for thermal shutdown of IC regulator?
A. Spikes in temperature
B. Decrease in temperature
C. Fluctuation in temperature
D. Increase in temperature
Answer:A
Explanation: The switching element dissipates negligible power in either on or off state. Therefore, the switching regulator is more efficient than the linear regulators. 6. State the reason for thermal shutdown of IC regulator?
A. Spikes in temperature B. Decrease in temperature C. Fluctuation in temperature D. Increase in temperature
Explanation: The IC regulator has a temperature sensor (built-in) which turn off the IC, when it becomes too hot (usually 125oC-150oC). The output current will drop and remains there until the IC has cooled significantly. 7. Find the difference between output current having a load of 100Ω and 120Ω for 7805 IC regulator. Consider the following specification: Voltage across the load = 5v; Voltage across the internal resistor= 350mv.