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
+−12 VD = ?LCR−+28 V

An ideal inverting buck-boost converter must produce −28 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = −28 V
D =
2.Easy
+−24 VD = ?LCR+−6 V

An ideal buck converter must produce 6 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 6 V
D =
3.Medium
+−36 VLSCR = 2.5 Ω+−48 V

An ideal boost converter turns 36 V into 48 V for a 2.5 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 48 VR = 2.5 Ω
IL = A
4.Medium
+−12 VSL = ?CR+−6 V

An ideal buck converter turns 12 V into 6 V at a switching frequency of 250 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.4 A.

Vin​ = 12 VVo​ = 6 Vf = 250 kHzΔIL = 0.4 A
L = µH
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 9 V into −27 V for a 2 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = −27 Vf = 200 kHzR = 2 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 24 V into 80 V for a 2 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 80 Vf = 20 kHzR = 2 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.7
  2. 2. D = 0.25
  3. 3. IL = 25.6 A
  4. 4. L = 30 µH
  5. 5. Lcrit = 0.3125 µH
  6. 6. Lcrit = 3.15 µH

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