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
+−36 VD = ?LCR−+12 V

An ideal inverting buck-boost converter must produce −12 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = −12 V
D =
2.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
3.Medium
+−36 VLSCR = 5 Ω+−48 V

An ideal boost converter turns 36 V into 48 V for a 5 Ω load. Find the average inductor current IL.

Vin​ = 36 VVo​ = 48 VR = 5 Ω
IL = A
4.Medium
+−48 VSL = ?CR+−19.2 V

An ideal buck converter turns 48 V into 19.2 V at a switching frequency of 100 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.8 A.

Vin​ = 48 VVo​ = 19.2 Vf = 100 kHzΔIL = 0.8 A
L = µH
5.Hard
+−24 VLSC = 22 µFR = 2 Ω+−48 V

An ideal boost converter turns 24 V into 48 V for a 2 Ω load at 250 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 48 Vf = 250 kHzC = 22 µFR = 2 Ω
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 24 V into 14.4 V for a 20 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 14.4 Vf = 100 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.25
  2. 2. Vo = 16.8 V
  3. 3. IL = 12.8 A
  4. 4. L = 144 µH
  5. 5. ΔVo = 2182 mV
  6. 6. Lcrit = 40 µH

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