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 VLD = ?CR+−192 V

An ideal boost converter must produce 192 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = 192 V
D =
2.Easy
+−48 VLD = 0.4CR+−Vo​ = ?

An ideal boost 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
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 9 V into 6.3 V for a 4 Ω load. It switches at 200 kHz with L = 10 µH. Find the peak inductor current Imax.

Vin​ = 9 VVo​ = 6.3 Vf = 200 kHzL = 10 µHR = 4 Ω
Imax = A
4.Medium
+−48 VLSCR = 20 Ω+−160 V

An ideal boost converter turns 48 V into 160 V for a 20 Ω load. Find the average inductor current IL.

Vin​ = 48 VVo​ = 160 VR = 20 Ω
IL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 36 V into 25.2 V for a 4 Ω load at 500 kHz, with L = 33 µH and C = 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 25.2 Vf = 500 kHzL = 33 µHC = 22 µF
ΔVo = mV
6.Hard
+−24 VSL = 100 µHC = ?R+−7.2 V

A buck converter turns 24 V into 7.2 V at 250 kHz with L = 100 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 5 mV.

Vin​ = 24 VVo​ = 7.2 Vf = 250 kHzL = 100 µHΔVo = 5 mV
C = µF

Answer key

  1. 1. D = 0.75
  2. 2. Vo = 80 V
  3. 3. Imax = 2.047 A
  4. 4. IL = 26.67 A
  5. 5. ΔVo = 5.207 mV
  6. 6. C = 20.16 µF

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