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 VLD = 0.4CR+−Vo​ = ?

An ideal boost converter runs from 9 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.4
Vo = V
2.Easy
+−24 VLD = ?CR+−60 V

An ideal boost converter must produce 60 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 60 V
D =
3.Medium
+−48 VSL = ?CR+−33.6 V

An ideal buck converter turns 48 V into 33.6 V at a switching frequency of 500 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.6 A.

Vin​ = 48 VVo​ = 33.6 Vf = 500 kHzΔIL = 0.6 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 20 V at 40 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 20 Vf = 40 kHzL = 47 µH
ΔIL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 48 V into 24 V at 100 kHz with L = 68 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 48 VVo​ = 24 Vf = 100 kHzL = 68 µH
Io,min = A
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 24 V into 16.8 V at 50 kHz with L = 33 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 24 VVo​ = 16.8 Vf = 50 kHzL = 33 µH
Io,min = A

Answer key

  1. 1. Vo = 15 V
  2. 2. D = 0.6
  3. 3. L = 33.6 µH
  4. 4. ΔIL = 2.553 A
  5. 5. Io,min = 0.8824 A
  6. 6. Io,min = 1.527 A

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