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
+−48 VD = ?LCR−+16 V

An ideal inverting buck-boost converter must produce −16 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = −16 V
D =
2.Easy
+−12 VLD = ?CR+−30 V

An ideal boost converter must produce 30 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = 30 V
D =
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 15 V into 9 V for a 10 Ω load. It switches at 500 kHz with L = 22 µH. Find the peak inductor current Imax.

Vin​ = 15 VVo​ = 9 Vf = 500 kHzL = 22 µHR = 10 Ω
Imax = A
4.Medium
+−9 VLSCR = 4 Ω+−30 V

An ideal boost converter turns 9 V into 30 V for a 4 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 30 VR = 4 Ω
IL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 15 V into 50 V for a 4 Ω load at 40 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = 50 Vf = 40 kHzR = 4 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 9 V into 36 V for a 50 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 36 Vf = 20 kHzR = 50 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.25
  2. 2. D = 0.6
  3. 3. Imax = 1.064 A
  4. 4. IL = 25 A
  5. 5. Lcrit = 3.15 µH
  6. 6. Lcrit = 58.59 µH

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