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
+−36 VD = ?LCR+−18 V

An ideal buck converter must produce 18 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 18 V
D =
2.Easy
+−48 VLD = ?CR+−192 V

An ideal 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
+−12 VLSCR = 8 Ω+−16 V

An ideal boost converter turns 12 V into 16 V for an 8 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 16 VR = 8 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 60 V at 50 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 60 Vf = 50 kHzL = 100 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 24 V into 12 V for a 25 Ω load at 100 kHz, with L = 150 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 12 Vf = 100 kHzL = 150 µHC = 470 µF
ΔVo = mV
6.Hard
+−9 VLSC = 100 µFR = 20 Ω+−15 V

An ideal boost converter turns 9 V into 15 V for a 20 Ω load at 250 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 15 Vf = 250 kHzC = 100 µFR = 20 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.5
  2. 2. D = 0.75
  3. 3. IL = 2.667 A
  4. 4. ΔIL = 2.88 A
  5. 5. ΔVo = 1.064 mV
  6. 6. ΔVo = 12 mV

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