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
+−9 VLD = 0.4CR+−Vo​ = ?

An ideal boost converter runs from 9 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.4
Vo = V
2.Easy
+−5 VLD = ?CR+−25 V

An ideal boost converter must produce 25 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 25 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 36 V into 60 V at 250 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 60 Vf = 250 kHzL = 68 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 14.4 V at 500 kHz with L = 10 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 14.4 Vf = 500 kHzL = 10 µH
ΔIL = A
5.Hard
+−24 VSLC = 220 µFR = 25 Ω−+−24 V

An ideal buck-boost converter turns 24 V into −24 V for a 25 Ω load at 500 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −24 Vf = 500 kHzC = 220 µFR = 25 Ω
ΔVo = mV
6.Hard
+−24 VSLC = 100 µFR = 50 Ω−+−56 V

An ideal buck-boost converter turns 24 V into −56 V for a 50 Ω load at 25 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −56 Vf = 25 kHzC = 100 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 15 V
  2. 2. D = 0.8
  3. 3. ΔIL = 0.8471 A
  4. 4. ΔIL = 1.728 A
  5. 5. ΔVo = 4.364 mV
  6. 6. ΔVo = 313.6 mV

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