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
+−36 VLD = ?CR+−48 V

An ideal boost converter must produce 48 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 48 V
D =
2.Easy
+−12 VD = 0.3LCR+−Vo​ = ?

An ideal buck converter runs from 12 V with a duty cycle D = 0.3 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.3
Vo = V
3.Medium
+−24 VSL = ?CR+−16.8 V

An ideal buck converter turns 24 V into 16.8 V at a switching frequency of 40 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 1 A.

Vin​ = 24 VVo​ = 16.8 Vf = 40 kHzΔIL = 1 A
L = µH
4.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
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 15 V into −22.5 V for a 10 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = −22.5 Vf = 250 kHzR = 10 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 9 V into 12 V for a 50 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 12 Vf = 25 kHzR = 50 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.25
  2. 2. Vo = 3.6 V
  3. 3. L = 126 µH
  4. 4. IL = 21.33 A
  5. 5. Lcrit = 3.2 µH
  6. 6. Lcrit = 140.6 µH

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