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 = 0.25CR+−Vo​ = ?

An ideal boost converter runs from 12 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.25
Vo = V
2.Easy
+−9 VD = ?LCR+−7.2 V

An ideal buck converter must produce 7.2 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 7.2 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 6.3 V at 40 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 6.3 Vf = 40 kHzL = 22 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 6 V at 40 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 6 Vf = 40 kHzL = 100 µH
ΔIL = A
5.Hard
+−12 VLSC = 220 µFR = 25 Ω+−30 V

An ideal boost converter turns 12 V into 30 V for a 25 Ω load at 20 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 30 Vf = 20 kHzC = 220 µFR = 25 Ω
ΔVo = mV
6.Hard
+−48 VSLC = 220 µFR = 5 Ω−+−72 V

An ideal buck-boost converter turns 48 V into −72 V for a 5 Ω load at 500 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = −72 Vf = 500 kHzC = 220 µFR = 5 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 16 V
  2. 2. D = 0.8
  3. 3. ΔIL = 2.148 A
  4. 4. ΔIL = 0.75 A
  5. 5. ΔVo = 163.6 mV
  6. 6. ΔVo = 78.55 mV

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