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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Name: ____________________   Date: ____________

1.Easy
+−36 VLD = ?CR+−90 V

An ideal boost converter must produce 90 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 90 V
D =
2.Easy
+−9 VLD = ?CR+−36 V

An ideal boost converter must produce 36 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 36 V
D =
3.Medium
+−9 VLSCR = 20 Ω+−22.5 V

An ideal boost converter turns 9 V into 22.5 V for a 20 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 22.5 VR = 20 Ω
IL = A
4.Medium
+−24 VLSCR = 15 Ω+−40 V

An ideal boost converter turns 24 V into 40 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 40 VR = 15 Ω
IL = A
5.Hard
+−48 VSLC = 220 µFR = 10 Ω−+−72 V

An ideal buck-boost converter turns 48 V into −72 V for a 10 Ω load at 50 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = −72 Vf = 50 kHzC = 220 µFR = 10 Ω
ΔVo = mV
6.Hard
+−48 VSLC = 47 µFR = 5 Ω−+−144 V

An ideal buck-boost converter turns 48 V into −144 V for a 5 Ω load at 500 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = −144 Vf = 500 kHzC = 47 µFR = 5 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.6
  2. 2. D = 0.75
  3. 3. IL = 2.813 A
  4. 4. IL = 4.444 A
  5. 5. ΔVo = 392.7 mV
  6. 6. ΔVo = 919.1 mV

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