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 VLSCR+−30 V

An ideal boost converter turns 12 V into 30 V and delivers 0.5 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 30 VIo = 0.5 A
Iin = A
2.Easy
+−5 VSLCR−+7.5 V

An ideal buck-boost converter turns 5 V into 7.5 V and delivers 4 A to its load. Find the average input current Iin.

Vin​ = 5 VVo​ = 7.5 VIo = 4 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 10.8 V at 25 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 10.8 Vf = 25 kHzL = 150 µH
ΔIL = A
4.Medium
+−12 VLSCR = 4 Ω+−20 V

An ideal boost converter turns 12 V into 20 V for a 4 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 20 VR = 4 Ω
IL = A
5.Hard
+−36 VSL = 68 µHC = ?R+−10.8 V

A buck converter turns 36 V into 10.8 V at 200 kHz with L = 68 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 10 mV.

Vin​ = 36 VVo​ = 10.8 Vf = 200 kHzL = 68 µHΔVo = 10 mV
C = µF
6.Hard
+−36 VLSC = 220 µFR = 8 Ω+−72 V

An ideal boost converter turns 36 V into 72 V for an 8 Ω load at 50 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 72 Vf = 50 kHzC = 220 µFR = 8 Ω
ΔVo = mV

Answer key

  1. 1. Iin = 1.25 A
  2. 2. Iin = 6 A
  3. 3. ΔIL = 2.016 A
  4. 4. IL = 8.333 A
  5. 5. C = 34.74 µF
  6. 6. ΔVo = 409.1 mV

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