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
+−9 VD = ?LCR−+3 V

An ideal inverting buck-boost converter must produce −3 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = −3 V
D =
2.Easy
+−5 VD = 0.5LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.5 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.5
|Vo| = V
3.Medium
+−12 VLSCR = 25 Ω+−24 V

An ideal boost converter turns 12 V into 24 V for a 25 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 24 VR = 25 Ω
IL = A
4.Medium
+−9 VLSCR = 25 Ω+−30 V

An ideal boost converter turns 9 V into 30 V for a 25 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 30 VR = 25 Ω
IL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 9 V into −9 V for a 2 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = −9 Vf = 25 kHzR = 2 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 9 V into 6.3 V for a 20 Ω load at 40 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 6.3 Vf = 40 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.25
  2. 2. |Vo| = 5 V
  3. 3. IL = 1.92 A
  4. 4. IL = 4 A
  5. 5. Lcrit = 10 µH
  6. 6. Lcrit = 75 µH

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