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 = 0.6LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 15 V with a duty cycle D = 0.6 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 15 VD = 0.6
|Vo| = V
2.Easy
+−48 VD = ?LCR−+112 V

An ideal inverting buck-boost converter must produce −112 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = −112 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 21.6 V at 200 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 21.6 Vf = 200 kHzL = 22 µH
ΔIL = A
4.Medium
+−15 VLSCR = 10 Ω+−37.5 V

An ideal boost converter turns 15 V into 37.5 V for a 10 Ω load. Find the average inductor current IL.

Vin​ = 15 VVo​ = 37.5 VR = 10 Ω
IL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 15 V into 7.5 V for a 10 Ω load at 40 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = 7.5 Vf = 40 kHzR = 10 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 12 V into 24 V for a 20 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 24 Vf = 200 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. |Vo| = 22.5 V
  2. 2. D = 0.7
  3. 3. ΔIL = 1.964 A
  4. 4. IL = 9.375 A
  5. 5. Lcrit = 62.5 µH
  6. 6. Lcrit = 6.25 µH

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