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
+−24 VD = 0.7LCR+−Vo​ = ?

An ideal buck converter runs from 24 V with a duty cycle D = 0.7 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.7
Vo = V
2.Easy
+−36 VD = ?LCR−+108 V

An ideal inverting buck-boost converter must produce −108 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = −108 V
D =
3.Medium
+−12 VSL = ?CR+−6 V

An ideal buck converter turns 12 V into 6 V at a switching frequency of 500 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.8 A.

Vin​ = 12 VVo​ = 6 Vf = 500 kHzΔIL = 0.8 A
L = µH
4.Medium
+−24 VLSCR = 12 Ω+−80 V

An ideal boost converter turns 24 V into 80 V for a 12 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 80 VR = 12 Ω
IL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 3 V for a 2 Ω load at 200 kHz, with L = 150 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 3 Vf = 200 kHzL = 150 µHC = 220 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 12 V into 40 V for a 2 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 40 Vf = 25 kHzR = 2 Ω
Lcrit = µH

Answer key

  1. 1. Vo = 16.8 V
  2. 2. D = 0.75
  3. 3. L = 7.5 µH
  4. 4. IL = 22.22 A
  5. 5. ΔVo = 0.2131 mV
  6. 6. Lcrit = 2.52 µH

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