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 VLD = 0.25CR+−Vo​ = ?

An ideal boost converter runs from 24 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.25
Vo = V
2.Easy
+−5 VD = ?LCR+−1 V

An ideal buck converter must produce 1 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 1 V
D =
3.Medium
+−9 VLSCR = 10 Ω+−12 V

An ideal boost converter turns 9 V into 12 V for a 10 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 12 VR = 10 Ω
IL = A
4.Medium
+−9 VLSCR = 15 Ω+−36 V

An ideal boost converter turns 9 V into 36 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 36 VR = 15 Ω
IL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 24 V into 18 V for a 2 Ω load at 20 kHz, with L = 100 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 18 Vf = 20 kHzL = 100 µHC = 470 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 36 V into −54 V for a 2 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = −54 Vf = 500 kHzR = 2 Ω
Lcrit = µH

Answer key

  1. 1. Vo = 32 V
  2. 2. D = 0.2
  3. 3. IL = 1.6 A
  4. 4. IL = 9.6 A
  5. 5. ΔVo = 29.92 mV
  6. 6. Lcrit = 0.32 µH

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