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
+−5 VLD = 0.75CR+−Vo​ = ?

An ideal boost converter runs from 5 V with a duty cycle D = 0.75 in continuous conduction. Find the output voltage Vo.

Vin​ = 5 VD = 0.75
Vo = V
2.Easy
+−12 VD = ?LCR−+3 V

An ideal inverting buck-boost converter must produce −3 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = −3 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 9 V into −21 V at 50 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = −21 Vf = 50 kHzL = 33 µH
ΔIL = A
4.Medium
+−36 VLSCR = 12 Ω+−120 V

An ideal boost converter turns 36 V into 120 V for a 12 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 120 VR = 12 Ω
IL = A
5.Hard
+−36 VSLC = 100 µFR = 10 Ω−+−36 V

An ideal buck-boost converter turns 36 V into −36 V for a 10 Ω load at 100 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = −36 Vf = 100 kHzC = 100 µFR = 10 Ω
ΔVo = mV
6.Hard
+−24 VLSC = 10 µFR = 10 Ω+−96 V

An ideal boost converter turns 24 V into 96 V for a 10 Ω load at 25 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 96 Vf = 25 kHzC = 10 µFR = 10 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 20 V
  2. 2. D = 0.2
  3. 3. ΔIL = 3.818 A
  4. 4. IL = 33.33 A
  5. 5. ΔVo = 180 mV
  6. 6. ΔVo = 28800 mV

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