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 = ?CR+−30 V

An ideal boost converter must produce 30 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = 30 V
D =
3.Medium
+−24 VLSCR = 2 Ω+−32 V

An ideal boost converter turns 24 V into 32 V for a 2 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 32 VR = 2 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 33.6 V at 500 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 33.6 Vf = 500 kHzL = 100 µH
ΔIL = A
5.Hard
+−9 VSL = 100 µHC = ?R+−3.6 V

A buck converter turns 9 V into 3.6 V at 25 kHz with L = 100 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 100 mV.

Vin​ = 9 VVo​ = 3.6 Vf = 25 kHzL = 100 µHΔVo = 100 mV
C = µF
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 48 V into 24 V for a 10 Ω load at 500 kHz, with L = 33 µH and C = 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 24 Vf = 500 kHzL = 33 µHC = 47 µF
ΔVo = mV

Answer key

  1. 1. |Vo| = 5 V
  2. 2. D = 0.6
  3. 3. IL = 21.33 A
  4. 4. ΔIL = 0.2016 A
  5. 5. C = 43.2 µF
  6. 6. ΔVo = 3.868 mV

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