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
+−15 VD = ?LCR−+45 V

An ideal inverting buck-boost converter must produce −45 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = −45 V
D =
2.Easy
+−24 VD = ?LCR+−4.8 V

An ideal buck converter must produce 4.8 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 4.8 V
D =
3.Medium
+−12 VLSCR = 8 Ω+−16 V

An ideal boost converter turns 12 V into 16 V for an 8 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 16 VR = 8 Ω
IL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 15 V into 10.5 V for a 25 Ω load. It switches at 20 kHz with L = 330 µH. Find the peak inductor current Imax.

Vin​ = 15 VVo​ = 10.5 Vf = 20 kHzL = 330 µHR = 25 Ω
Imax = A
5.Hard
+−24 VSL = 150 µHC = ?R+−16.8 V

A buck converter turns 24 V into 16.8 V at 250 kHz with L = 150 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 5 mV.

Vin​ = 24 VVo​ = 16.8 Vf = 250 kHzL = 150 µHΔVo = 5 mV
C = µF
6.Hard
+−24 VSL = 100 µHC = ?R+−7.2 V

A buck converter turns 24 V into 7.2 V at 500 kHz with L = 100 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 50 mV.

Vin​ = 24 VVo​ = 7.2 Vf = 500 kHzL = 100 µHΔVo = 50 mV
C = µF

Answer key

  1. 1. D = 0.75
  2. 2. D = 0.2
  3. 3. IL = 2.667 A
  4. 4. Imax = 0.6586 A
  5. 5. C = 13.44 µF
  6. 6. C = 0.504 µF

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