PowerWise® Design University
POWER 200 - Switching Regulator Fundamentals
In a fixed frequency switching regulator, the method used to control the duty cycle is known as:
pulse frequency modulation
pulse width modulation
pulse position modulation
pulse carrier modulation
An ideal boost converter has 5V in and 15V out. What is the duty cycle?
0.667
0.333
0.50
0.75
In a buck-boost converter, the inductor is connected to:
input
output
ground
input + output
A 4uH inductor has 3V across it for 2us. How much does the current change?
0.67A
1.5A
2.67A
6A
In a practical switching regulator, which voltage is considered to be a loss element?
the input capacitor voltage
the inductor voltage
the output capacitor voltage
the diode voltage
In a buck-boost converter, the DC (average) inductor current is equal to the:
input current
output current
input + output current
input - output current
The quantity D is equal to:
t(off)/T
t(on)/t(off)
T/t(off)
none of the above
In a switching regulator at steady state, the average voltage across the inductor is:
positive
zero
negative
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