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
+−24 VD = 0.75LCR+−Vo​ = ?

An ideal buck converter runs from 24 V with a duty cycle D = 0.75 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.75
Vo = V
2.Easy
+−48 VD = ?LCR−+192 V

An ideal inverting buck-boost converter must produce −192 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = −192 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 32 V at 50 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 32 Vf = 50 kHzL = 330 µH
ΔIL = A
4.Medium
+−36 VLSCR = 4 Ω+−72 V

An ideal boost converter turns 36 V into 72 V for a 4 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 72 VR = 4 Ω
IL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 12 V into −18 V for a 4 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = −18 Vf = 500 kHzR = 4 Ω
Lcrit = µH
6.Hard
+−24 VLSC = 220 µFR = 20 Ω+−40 V

An ideal boost converter turns 24 V into 40 V for a 20 Ω load at 50 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 40 Vf = 50 kHzC = 220 µFR = 20 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 18 V
  2. 2. D = 0.8
  3. 3. ΔIL = 0.3636 A
  4. 4. IL = 36 A
  5. 5. Lcrit = 0.64 µH
  6. 6. ΔVo = 72.73 mV

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