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
+−9 VD = ?LCR−+21 V

An ideal inverting buck-boost converter must produce −21 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = −21 V
D =
2.Easy
+−24 VLD = 0.6CR+−Vo​ = ?

An ideal boost converter runs from 24 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.6
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 9 V into 15 V at 40 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 15 Vf = 40 kHzL = 33 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 36 V into 60 V at 200 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 60 Vf = 200 kHzL = 68 µH
ΔIL = A
5.Hard
+−36 VSL = 220 µHC = ?R+−21.6 V

A buck converter turns 36 V into 21.6 V at 20 kHz with L = 220 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 100 mV.

Vin​ = 36 VVo​ = 21.6 Vf = 20 kHzL = 220 µHΔVo = 100 mV
C = µF
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 24 V into 14.4 V at 20 kHz with L = 150 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 24 VVo​ = 14.4 Vf = 20 kHzL = 150 µH
Io,min = A

Answer key

  1. 1. D = 0.7
  2. 2. Vo = 60 V
  3. 3. ΔIL = 2.727 A
  4. 4. ΔIL = 1.059 A
  5. 5. C = 122.7 µF
  6. 6. Io,min = 0.96 A

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