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
+−24 VSLCR−+24 V

An ideal buck-boost converter turns 24 V into 24 V and delivers 1.5 A to its load. Find the average input current Iin.

Vin​ = 24 VVo​ = 24 VIo = 1.5 A
Iin = A
2.Easy
+−9 VD = ?LCR+−1.8 V

An ideal buck converter must produce 1.8 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 1.8 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 2.7 V at 25 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 2.7 Vf = 25 kHzL = 100 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 15 V into 10.5 V for a 4 Ω load. It switches at 500 kHz with L = 10 µH. Find the peak inductor current Imax.

Vin​ = 15 VVo​ = 10.5 Vf = 500 kHzL = 10 µHR = 4 Ω
Imax = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 12 V into 48 V for a 25 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 48 Vf = 250 kHzR = 25 Ω
Lcrit = µH
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 8.4 V for an 8 Ω load at 100 kHz, with L = 150 µH and C = 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 8.4 Vf = 100 kHzL = 150 µHC = 22 µF
ΔVo = mV

Answer key

  1. 1. Iin = 1.5 A
  2. 2. D = 0.2
  3. 3. ΔIL = 0.756 A
  4. 4. Imax = 2.94 A
  5. 5. Lcrit = 2.344 µH
  6. 6. ΔVo = 9.545 mV

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