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
+−5 VLD = 0.5CR+−Vo​ = ?

An ideal boost converter runs from 5 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 5 VD = 0.5
Vo = V
2.Easy
+−36 VD = 0.5LCR+−Vo​ = ?

An ideal buck converter runs from 36 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.5
Vo = V
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 15 V into 9 V for a 25 Ω load. It switches at 100 kHz with L = 220 µH. Find the peak inductor current Imax.

Vin​ = 15 VVo​ = 9 Vf = 100 kHzL = 220 µHR = 25 Ω
Imax = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 80 V at 250 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 80 Vf = 250 kHzL = 47 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 15 V into 9 V for a 25 Ω load at 50 kHz, with L = 220 µH and C = 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 9 Vf = 50 kHzL = 220 µHC = 22 µF
ΔVo = mV
6.Hard
+−48 VSLC = 47 µFR = 50 Ω−+−32 V

An ideal buck-boost converter turns 48 V into −32 V for a 50 Ω load at 25 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = −32 Vf = 25 kHzC = 47 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 10 V
  2. 2. Vo = 18 V
  3. 3. Imax = 0.4418 A
  4. 4. ΔIL = 1.634 A
  5. 5. ΔVo = 37.19 mV
  6. 6. ΔVo = 217.9 mV

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