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
+−5 VD = ?LCR+−1 V

An ideal buck converter must produce 1 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 1 V
D =
2.Easy
+−15 VLD = 0.5CR+−Vo​ = ?

An ideal boost converter runs from 15 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.5
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 36 V into 72 V at 250 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 72 Vf = 250 kHzL = 33 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 27 V at 25 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 27 Vf = 25 kHzL = 330 µH
ΔIL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 9 V into 6.3 V at 250 kHz with L = 330 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 9 VVo​ = 6.3 Vf = 250 kHzL = 330 µH
Io,min = A
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 15 V into 10.5 V at 500 kHz with L = 10 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 15 VVo​ = 10.5 Vf = 500 kHzL = 10 µH
Io,min = A

Answer key

  1. 1. D = 0.2
  2. 2. Vo = 30 V
  3. 3. ΔIL = 2.182 A
  4. 4. ΔIL = 0.8182 A
  5. 5. Io,min = 0.01145 A
  6. 6. Io,min = 0.315 A

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