DC-DC converters worksheet with answers

Free printable DC-DC converters worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy
+−5 VD = 0.5LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.5 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.5
|Vo| = V
2.Easy
+−12 VLD = 0.6CR+−Vo​ = ?

An ideal boost converter runs from 12 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.6
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 36 V into 120 V at 40 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 120 Vf = 40 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 9 V into 5.4 V for a 20 Ω load. It switches at 250 kHz with L = 22 µH. Find the peak inductor current Imax.

Vin​ = 9 VVo​ = 5.4 Vf = 250 kHzL = 22 µHR = 20 Ω
Imax = A
5.Hard
+−48 VSL = 47 µHC = ?R+−12 V

A buck converter turns 48 V into 12 V at 500 kHz with L = 47 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 10 mV.

Vin​ = 48 VVo​ = 12 Vf = 500 kHzL = 47 µHΔVo = 10 mV
C = µF
6.Hard
+−36 VSL = 150 µHC = ?R+−27 V

A buck converter turns 36 V into 27 V at 100 kHz with L = 150 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 5 mV.

Vin​ = 36 VVo​ = 27 Vf = 100 kHzL = 150 µHΔVo = 5 mV
C = µF

Answer key

  1. 1. |Vo| = 5 V
  2. 2. Vo = 30 V
  3. 3. ΔIL = 2.864 A
  4. 4. Imax = 0.4664 A
  5. 5. C = 9.574 µF
  6. 6. C = 112.5 µF

Full step-by-step solutions: practise this topic on examproblems.com.