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
+−15 VD = ?LCR−+10 V

An ideal inverting buck-boost converter must produce −10 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = −10 V
D =
2.Easy
+−48 VD = 0.65LCR+−Vo​ = ?

An ideal buck converter runs from 48 V with a duty cycle D = 0.65 in continuous conduction. Find the output voltage Vo.

Vin​ = 48 VD = 0.65
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 3 V at 40 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 3 Vf = 40 kHzL = 100 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −18 V at 40 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −18 Vf = 40 kHzL = 220 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 9 V into −6 V for a 10 Ω load at 40 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = −6 Vf = 40 kHzR = 10 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 12 V into −36 V for a 20 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = −36 Vf = 500 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.4
  2. 2. Vo = 31.2 V
  3. 3. ΔIL = 0.5625 A
  4. 4. ΔIL = 0.8182 A
  5. 5. Lcrit = 45 µH
  6. 6. Lcrit = 1.25 µH

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