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
+−5 VSLCR−+1.667 V

An ideal buck-boost converter turns 5 V into 1.667 V and delivers 3 A to its load. Find the average input current Iin.

Vin​ = 5 VVo​ = 1.667 VIo = 3 A
Iin = A
2.Easy
+−48 VD = 0.2LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 48 V with a duty cycle D = 0.2 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 48 VD = 0.2
|Vo| = V
3.Medium
+−12 VSL = ?CR+−3.6 V

An ideal buck converter turns 12 V into 3.6 V at a switching frequency of 50 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.2 A.

Vin​ = 12 VVo​ = 3.6 Vf = 50 kHzΔIL = 0.2 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 36 V into −36 V at 20 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = −36 Vf = 20 kHzL = 330 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 48 V into 24 V for a 20 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = 24 Vf = 25 kHzR = 20 Ω
Lcrit = µH
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 7.2 V for a 10 Ω load at 200 kHz, with L = 68 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 7.2 Vf = 200 kHzL = 68 µHC = 220 µF
ΔVo = mV

Answer key

  1. 1. Iin = 1 A
  2. 2. |Vo| = 12 V
  3. 3. L = 252 µH
  4. 4. ΔIL = 2.727 A
  5. 5. Lcrit = 200 µH
  6. 6. ΔVo = 0.6016 mV

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