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 VLD = 0.8CR+−Vo​ = ?

An ideal boost converter runs from 36 V with a duty cycle D = 0.8 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.8
Vo = V
2.Easy
+−24 VD = 0.4LCR+−Vo​ = ?

An ideal buck converter runs from 24 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.4
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 9 V into −3 V at 25 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = −3 Vf = 25 kHzL = 47 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 15 V into 37.5 V at 250 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 37.5 Vf = 250 kHzL = 220 µH
ΔIL = A
5.Hard
+−36 VSLC = 22 µFR = 25 Ω−+−24 V

An ideal buck-boost converter turns 36 V into −24 V for a 25 Ω load at 200 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = −24 Vf = 200 kHzC = 22 µFR = 25 Ω
ΔVo = mV
6.Hard
+−24 VLSC = 470 µFR = 20 Ω+−96 V

An ideal boost converter turns 24 V into 96 V for a 20 Ω load at 200 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 96 Vf = 200 kHzC = 470 µFR = 20 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 180 V
  2. 2. Vo = 9.6 V
  3. 3. ΔIL = 1.915 A
  4. 4. ΔIL = 0.1636 A
  5. 5. ΔVo = 87.27 mV
  6. 6. ΔVo = 38.3 mV

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