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
+−12 VLD = 0.5CR+−Vo​ = ?

An ideal boost converter runs from 12 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.5
Vo = V
2.Easy
+−12 VD = 0.25LCR+−Vo​ = ?

An ideal buck converter runs from 12 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.25
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 15 V into 30 V at 100 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 30 Vf = 100 kHzL = 47 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 9 V into −21 V at 200 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = −21 Vf = 200 kHzL = 33 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 15 V into −35 V for an 8 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = −35 Vf = 50 kHzR = 8 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 48 V into 14.4 V for a 5 Ω load at 40 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = 14.4 Vf = 40 kHzR = 5 Ω
Lcrit = µH

Answer key

  1. 1. Vo = 24 V
  2. 2. Vo = 3 V
  3. 3. ΔIL = 1.596 A
  4. 4. ΔIL = 0.9545 A
  5. 5. Lcrit = 7.2 µH
  6. 6. Lcrit = 43.75 µH

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