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
+−12 VLD = ?CR+−15 V

An ideal boost converter must produce 15 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = 15 V
D =
2.Easy
+−15 VLD = 0.8CR+−Vo​ = ?

An ideal boost converter runs from 15 V with a duty cycle D = 0.8 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.8
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 160 V at 100 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 160 Vf = 100 kHzL = 330 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 24 V into 7.2 V for a 4 Ω load. It switches at 25 kHz with L = 150 µH. Find the peak inductor current Imax.

Vin​ = 24 VVo​ = 7.2 Vf = 25 kHzL = 150 µHR = 4 Ω
Imax = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 48 V into 24 V at 20 kHz with L = 22 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 48 VVo​ = 24 Vf = 20 kHzL = 22 µH
Io,min = A
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 15 V into −35 V for an 8 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = −35 Vf = 20 kHzR = 8 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.2
  2. 2. Vo = 75 V
  3. 3. ΔIL = 1.018 A
  4. 4. Imax = 2.472 A
  5. 5. Io,min = 13.64 A
  6. 6. Lcrit = 18 µH

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