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
+−48 VD = ?LCR−+16 V

An ideal inverting buck-boost converter must produce −16 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = −16 V
D =
2.Easy
+−24 VLD = 0.4CR+−Vo​ = ?

An ideal boost converter runs from 24 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.4
Vo = V
3.Medium
+−48 VLSCR = 2 Ω+−192 V

An ideal boost converter turns 48 V into 192 V for a 2 Ω load. Find the average inductor current IL.

Vin​ = 48 VVo​ = 192 VR = 2 Ω
IL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 9 V into 5.4 V for a 12 Ω load. It switches at 40 kHz with L = 220 µH. Find the peak inductor current Imax.

Vin​ = 9 VVo​ = 5.4 Vf = 40 kHzL = 220 µHR = 12 Ω
Imax = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 12 V into 4.8 V at 50 kHz with L = 47 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 12 VVo​ = 4.8 Vf = 50 kHzL = 47 µH
Io,min = A
6.Hard
+−12 VSL = 330 µHC = ?R+−9 V

A buck converter turns 12 V into 9 V at 25 kHz with L = 330 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 20 mV.

Vin​ = 12 VVo​ = 9 Vf = 25 kHzL = 330 µHΔVo = 20 mV
C = µF

Answer key

  1. 1. D = 0.25
  2. 2. Vo = 40 V
  3. 3. IL = 384 A
  4. 4. Imax = 0.5727 A
  5. 5. Io,min = 0.6128 A
  6. 6. C = 68.18 µF

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