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
+−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 =
2.Easy
+−15 VSLCR+−6 V

An ideal buck converter turns 15 V into 6 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 15 VVo​ = 6 VIo = 5 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −22.5 V at 40 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −22.5 Vf = 40 kHzL = 330 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 12 V into 6 V for a 12 Ω load. It switches at 25 kHz with L = 330 µH. Find the peak inductor current Imax.

Vin​ = 12 VVo​ = 6 Vf = 25 kHzL = 330 µHR = 12 Ω
Imax = A
5.Hard
+−15 VSL = 330 µHC = ?R+−9 V

A buck converter turns 15 V into 9 V at 100 kHz with L = 330 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 100 mV.

Vin​ = 15 VVo​ = 9 Vf = 100 kHzL = 330 µHΔVo = 100 mV
C = µF
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 24 V into 16.8 V at 20 kHz with L = 330 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 24 VVo​ = 16.8 Vf = 20 kHzL = 330 µH
Io,min = A

Answer key

  1. 1. D = 0.5
  2. 2. Iin = 2 A
  3. 3. ΔIL = 0.6818 A
  4. 4. Imax = 0.6818 A
  5. 5. C = 1.364 µF
  6. 6. Io,min = 0.3818 A

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