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
+−24 VD = 0.25LCR+−Vo​ = ?

An ideal buck converter runs from 24 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.25
Vo = V
2.Easy
+−15 VLD = ?CR+−30 V

An ideal boost converter must produce 30 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 30 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −35 V at 250 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −35 Vf = 250 kHzL = 33 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 15 V into 7.5 V at 200 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 7.5 Vf = 200 kHzL = 47 µH
ΔIL = A
5.Hard
+−24 VSLC = 10 µFR = 50 Ω−+−56 V

An ideal buck-boost converter turns 24 V into −56 V for a 50 Ω load at 20 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −56 Vf = 20 kHzC = 10 µFR = 50 Ω
ΔVo = mV
6.Hard
+−36 VSLC = 22 µFR = 50 Ω−+−12 V

An ideal buck-boost converter turns 36 V into −12 V for a 50 Ω load at 40 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = −12 Vf = 40 kHzC = 22 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 6 V
  2. 2. D = 0.5
  3. 3. ΔIL = 1.273 A
  4. 4. ΔIL = 0.3989 A
  5. 5. ΔVo = 3920 mV
  6. 6. ΔVo = 68.18 mV

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