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 = 0.5CR+−Vo​ = ?

An ideal boost converter runs from 12 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.5
Vo = V
2.Easy
+−48 VD = 0.2LCR+−Vo​ = ?

An ideal buck converter runs from 48 V with a duty cycle D = 0.2 in continuous conduction. Find the output voltage Vo.

Vin​ = 48 VD = 0.2
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 120 V at 100 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 120 Vf = 100 kHzL = 220 µH
ΔIL = A
4.Medium
+−24 VLSCR = 20 Ω+−32 V

An ideal boost converter turns 24 V into 32 V for a 20 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 32 VR = 20 Ω
IL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 15 V into 7.5 V for a 2 Ω load at 500 kHz, with L = 22 µH and C = 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 7.5 Vf = 500 kHzL = 22 µHC = 10 µF
ΔVo = mV
6.Hard
+−9 VLSC = 220 µFR = 10 Ω+−18 V

An ideal boost converter turns 9 V into 18 V for a 10 Ω load at 25 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 18 Vf = 25 kHzC = 220 µFR = 10 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 24 V
  2. 2. Vo = 9.6 V
  3. 3. ΔIL = 1.309 A
  4. 4. IL = 2.133 A
  5. 5. ΔVo = 8.523 mV
  6. 6. ΔVo = 163.6 mV

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