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 = 0.5CR+−Vo​ = ?

An ideal boost converter runs from 9 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.5
Vo = V
2.Easy
+−5 VD = 0.7LCR+−Vo​ = ?

An ideal buck converter runs from 5 V with a duty cycle D = 0.7 in continuous conduction. Find the output voltage Vo.

Vin​ = 5 VD = 0.7
Vo = V
3.Medium
+−24 VLSCR = 10 Ω+−40 V

An ideal boost converter turns 24 V into 40 V for a 10 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 40 VR = 10 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 16 V at 25 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 16 Vf = 25 kHzL = 68 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 36 V into 14.4 V for a 12 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = 14.4 Vf = 25 kHzR = 12 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 9 V into −21 V for a 4 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = −21 Vf = 500 kHzR = 4 Ω
Lcrit = µH

Answer key

  1. 1. Vo = 18 V
  2. 2. Vo = 3.5 V
  3. 3. IL = 6.667 A
  4. 4. ΔIL = 1.765 A
  5. 5. Lcrit = 144 µH
  6. 6. Lcrit = 0.36 µH

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