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
+−24 VLD = 0.25CR+−Vo​ = ?

An ideal boost converter runs from 24 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.25
Vo = V
2.Easy
+−9 VLD = 0.6CR+−Vo​ = ?

An ideal boost converter runs from 9 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.6
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 15 V into 9 V at 25 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 9 Vf = 25 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 3.6 V at 200 kHz with L = 10 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 3.6 Vf = 200 kHzL = 10 µH
ΔIL = A
5.Hard
+−15 VSLC = 470 µFR = 5 Ω−+−22.5 V

An ideal buck-boost converter turns 15 V into −22.5 V for a 5 Ω load at 20 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = −22.5 Vf = 20 kHzC = 470 µFR = 5 Ω
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 8.4 V for a 12 Ω load at 25 kHz, with L = 150 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 8.4 Vf = 25 kHzL = 150 µHC = 470 µF
ΔVo = mV

Answer key

  1. 1. Vo = 32 V
  2. 2. Vo = 22.5 V
  3. 3. ΔIL = 0.96 A
  4. 4. ΔIL = 1.26 A
  5. 5. ΔVo = 287.2 mV
  6. 6. ΔVo = 7.149 mV

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