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
+−5 VSLCR−+15 V

An ideal buck-boost converter turns 5 V into 15 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 5 VVo​ = 15 VIo = 5 A
Iin = A
2.Easy
+−9 VLD = 0.7CR+−Vo​ = ?

An ideal boost converter runs from 9 V with a duty cycle D = 0.7 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.7
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 14.4 V at 50 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 14.4 Vf = 50 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 24 V into 14.4 V at 250 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 14.4 Vf = 250 kHzL = 68 µH
ΔIL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 24 V into 18 V at 25 kHz with L = 150 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 24 VVo​ = 18 Vf = 25 kHzL = 150 µH
Io,min = A
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 9 V into 22.5 V for an 8 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 22.5 Vf = 250 kHzR = 8 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 15 A
  2. 2. Vo = 30 V
  3. 3. ΔIL = 0.7855 A
  4. 4. ΔIL = 0.3388 A
  5. 5. Io,min = 0.6 A
  6. 6. Lcrit = 1.536 µH

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