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
+−12 VLD = 0.4CR+−Vo​ = ?

An ideal boost converter runs from 12 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.4
Vo = V
2.Easy
+−36 VD = ?LCR+−25.2 V

An ideal buck converter must produce 25.2 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 25.2 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 19.2 V at 40 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 19.2 Vf = 40 kHzL = 150 µH
ΔIL = A
4.Medium
+−9 VLSCR = 2.5 Ω+−18 V

An ideal boost converter turns 9 V into 18 V for a 2.5 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 18 VR = 2.5 Ω
IL = A
5.Hard
+−15 VLSC = 470 µFR = 20 Ω+−50 V

An ideal boost converter turns 15 V into 50 V for a 20 Ω load at 25 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 50 Vf = 25 kHzC = 470 µFR = 20 Ω
ΔVo = mV
6.Hard
+−9 VLSC = 100 µFR = 25 Ω+−22.5 V

An ideal boost converter turns 9 V into 22.5 V for a 25 Ω load at 40 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 22.5 Vf = 40 kHzC = 100 µFR = 25 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 20 V
  2. 2. D = 0.7
  3. 3. ΔIL = 1.92 A
  4. 4. IL = 14.4 A
  5. 5. ΔVo = 148.9 mV
  6. 6. ΔVo = 135 mV

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