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 = ?CR+−96 V

An ideal boost converter must produce 96 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 96 V
D =
2.Easy
+−12 VD = 0.7LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 12 V with a duty cycle D = 0.7 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 12 VD = 0.7
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 9 V at 500 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 9 Vf = 500 kHzL = 68 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 3.6 V at 100 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 3.6 Vf = 100 kHzL = 220 µH
ΔIL = A
5.Hard
+−24 VSLC = 220 µFR = 2 Ω−+−36 V

An ideal buck-boost converter turns 24 V into −36 V for a 2 Ω load at 40 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −36 Vf = 40 kHzC = 220 µFR = 2 Ω
ΔVo = mV
6.Hard
+−12 VSLC = 47 µFR = 25 Ω−+−8 V

An ideal buck-boost converter turns 12 V into −8 V for a 25 Ω load at 50 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = −8 Vf = 50 kHzC = 47 µFR = 25 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.75
  2. 2. |Vo| = 28 V
  3. 3. ΔIL = 0.06618 A
  4. 4. ΔIL = 0.1145 A
  5. 5. ΔVo = 1227 mV
  6. 6. ΔVo = 54.47 mV

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