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−+24 V

An ideal inverting buck-boost converter must produce −24 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = −24 V
D =
2.Easy
+−5 VLD = 0.8CR+−Vo​ = ?

An ideal boost converter runs from 5 V with a duty cycle D = 0.8 in continuous conduction. Find the output voltage Vo.

Vin​ = 5 VD = 0.8
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 36 V into 144 V at 100 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 144 Vf = 100 kHzL = 150 µH
ΔIL = A
4.Medium
+−15 VLSCR = 25 Ω+−20 V

An ideal boost converter turns 15 V into 20 V for a 25 Ω load. Find the average inductor current IL.

Vin​ = 15 VVo​ = 20 VR = 25 Ω
IL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 48 V into 33.6 V at 500 kHz with L = 100 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 48 VVo​ = 33.6 Vf = 500 kHzL = 100 µH
Io,min = A
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 24 V into 80 V for a 20 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 80 Vf = 250 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.4
  2. 2. Vo = 25 V
  3. 3. ΔIL = 1.8 A
  4. 4. IL = 1.067 A
  5. 5. Io,min = 0.1008 A
  6. 6. Lcrit = 2.52 µH

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