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
+−15 VD = ?LCR−+60 V

An ideal inverting buck-boost converter must produce −60 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = −60 V
D =
2.Easy
+−24 VLD = 0.75CR+−Vo​ = ?

An ideal boost converter runs from 24 V with a duty cycle D = 0.75 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.75
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 32 V at 100 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 32 Vf = 100 kHzL = 330 µH
ΔIL = A
4.Medium
+−15 VSL = ?CR+−10.5 V

An ideal buck converter turns 15 V into 10.5 V at a switching frequency of 100 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.6 A.

Vin​ = 15 VVo​ = 10.5 Vf = 100 kHzΔIL = 0.6 A
L = µH
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 24 V into 96 V for a 20 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 96 Vf = 200 kHzR = 20 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 15 V into −35 V for a 12 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = −35 Vf = 500 kHzR = 12 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.8
  2. 2. Vo = 96 V
  3. 3. ΔIL = 0.1818 A
  4. 4. L = 52.5 µH
  5. 5. Lcrit = 2.344 µH
  6. 6. Lcrit = 1.08 µH

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