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 VD = ?LCR+−21.6 V

An ideal buck converter must produce 21.6 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 21.6 V
D =
2.Easy
+−48 VSLCR+−19.2 V

An ideal buck converter turns 48 V into 19.2 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 48 VVo​ = 19.2 VIo = 5 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 24 V into −8 V at 200 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = −8 Vf = 200 kHzL = 330 µH
ΔIL = A
4.Medium
+−36 VLSCR = 15 Ω+−72 V

An ideal boost converter turns 36 V into 72 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 72 VR = 15 Ω
IL = A
5.Hard
+−12 VLSC = 10 µFR = 8 Ω+−16 V

An ideal boost converter turns 12 V into 16 V for an 8 Ω load at 250 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 16 Vf = 250 kHzC = 10 µFR = 8 Ω
ΔVo = mV
6.Hard
+−15 VLSC = 470 µFR = 10 Ω+−25 V

An ideal boost converter turns 15 V into 25 V for a 10 Ω load at 500 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 25 Vf = 500 kHzC = 470 µFR = 10 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.6
  2. 2. Iin = 2 A
  3. 3. ΔIL = 0.09091 A
  4. 4. IL = 9.6 A
  5. 5. ΔVo = 200 mV
  6. 6. ΔVo = 4.255 mV

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