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.

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1.Easy
+−15 VD = 0.75LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 15 V with a duty cycle D = 0.75 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 15 VD = 0.75
|Vo| = V
2.Easy
+−9 VLD = ?CR+−18 V

An ideal boost converter must produce 18 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 18 V
D =
3.Medium
+−24 VLSCR = 20 Ω+−60 V

An ideal boost converter turns 24 V into 60 V for a 20 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 60 VR = 20 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 36 V into −12 V at 200 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = −12 Vf = 200 kHzL = 22 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 12 V into 3 V for a 12 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 3 Vf = 25 kHzR = 12 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 48 V into 64 V for a 25 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = 64 Vf = 500 kHzR = 25 Ω
Lcrit = µH

Answer key

  1. 1. |Vo| = 45 V
  2. 2. D = 0.5
  3. 3. IL = 7.5 A
  4. 4. ΔIL = 2.045 A
  5. 5. Lcrit = 180 µH
  6. 6. Lcrit = 3.516 µH

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