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+−32 V

An ideal boost converter must produce 32 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 32 V
D =
2.Easy
+−5 VD = 0.5LCR+−Vo​ = ?

An ideal buck 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
3.Medium
+−48 VLSCR = 2.5 Ω+−96 V

An ideal boost converter turns 48 V into 96 V for a 2.5 Ω load. Find the average inductor current IL.

Vin​ = 48 VVo​ = 96 VR = 2.5 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 36 V into −84 V at 50 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = −84 Vf = 50 kHzL = 330 µH
ΔIL = A
5.Hard
+−48 VSL = 330 µHC = ?R+−36 V

A buck converter turns 48 V into 36 V at 500 kHz with L = 330 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 20 mV.

Vin​ = 48 VVo​ = 36 Vf = 500 kHzL = 330 µHΔVo = 20 mV
C = µF
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 15 V into 7.5 V at 20 kHz with L = 330 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 15 VVo​ = 7.5 Vf = 20 kHzL = 330 µH
Io,min = A

Answer key

  1. 1. D = 0.25
  2. 2. Vo = 2.5 V
  3. 3. IL = 76.8 A
  4. 4. ΔIL = 1.527 A
  5. 5. C = 0.6818 µF
  6. 6. Io,min = 0.2841 A

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