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
+−48 VD = 0.4LCR+−Vo​ = ?

An ideal buck converter runs from 48 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 48 VD = 0.4
Vo = V
2.Easy
+−36 VLD = 0.75CR+−Vo​ = ?

An ideal boost converter runs from 36 V with a duty cycle D = 0.75 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.75
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 48 V at 25 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 48 Vf = 25 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 24 V into 6 V at 50 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 6 Vf = 50 kHzL = 150 µH
ΔIL = A
5.Hard
+−36 VLSC = 220 µFR = 25 Ω+−144 V

An ideal boost converter turns 36 V into 144 V for a 25 Ω load at 250 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 144 Vf = 250 kHzC = 220 µFR = 25 Ω
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 9 V into 5.4 V for a 12 Ω load at 20 kHz, with L = 220 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 5.4 Vf = 20 kHzL = 220 µHC = 220 µF
ΔVo = mV

Answer key

  1. 1. Vo = 19.2 V
  2. 2. Vo = 144 V
  3. 3. ΔIL = 2.4 A
  4. 4. ΔIL = 0.6 A
  5. 5. ΔVo = 78.55 mV
  6. 6. ΔVo = 13.95 mV

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