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
+−48 VD = ?LCR−+192 V

An ideal inverting buck-boost converter must produce −192 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = −192 V
D =
2.Easy
+−9 VLD = 0.8CR+−Vo​ = ?

An ideal boost converter runs from 9 V with a duty cycle D = 0.8 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.8
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 9 V at 200 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 9 Vf = 200 kHzL = 22 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −4 V at 100 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −4 Vf = 100 kHzL = 150 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 24 V into 16.8 V for a 50 Ω load at 40 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 16.8 Vf = 40 kHzR = 50 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 15 V into −5 V for a 10 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = −5 Vf = 100 kHzR = 10 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.8
  2. 2. Vo = 45 V
  3. 3. ΔIL = 1.534 A
  4. 4. ΔIL = 0.2 A
  5. 5. Lcrit = 187.5 µH
  6. 6. Lcrit = 28.13 µH

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