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+−37.5 V

An ideal boost converter must produce 37.5 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 37.5 V
D =
2.Easy
+−12 VD = 0.4LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 12 V with a duty cycle D = 0.4 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 12 VD = 0.4
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 9 V into −9 V at 50 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = −9 Vf = 50 kHzL = 150 µH
ΔIL = A
4.Medium
+−36 VLSCR = 15 Ω+−90 V

An ideal boost converter turns 36 V into 90 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 90 VR = 15 Ω
IL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 9 V into 3.6 V for a 2 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​ = 9 VVo​ = 3.6 Vf = 500 kHzL = 33 µHC = 22 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 24 V into 32 V for a 5 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 32 Vf = 25 kHzR = 5 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.6
  2. 2. |Vo| = 8 V
  3. 3. ΔIL = 0.6 A
  4. 4. IL = 15 A
  5. 5. ΔVo = 1.488 mV
  6. 6. Lcrit = 14.06 µH

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