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
+−15 VLD = ?CR+−60 V

An ideal boost converter must produce 60 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 60 V
D =
2.Easy
+−9 VLD = ?CR+−36 V

An ideal boost converter must produce 36 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 36 V
D =
3.Medium
+−36 VLSCR = 20 Ω+−144 V

An ideal boost converter turns 36 V into 144 V for a 20 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 144 VR = 20 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 48 V at 50 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 48 Vf = 50 kHzL = 100 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 24 V into 96 V for a 25 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 96 Vf = 200 kHzR = 25 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 15 V into 37.5 V for an 8 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = 37.5 Vf = 100 kHzR = 8 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.75
  2. 2. D = 0.75
  3. 3. IL = 28.8 A
  4. 4. ΔIL = 2.4 A
  5. 5. Lcrit = 2.93 µH
  6. 6. Lcrit = 3.84 µH

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