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
+−36 VLD = ?CR+−144 V

An ideal boost converter must produce 144 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 144 V
D =
2.Easy
+−36 VD = 0.25LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 36 V with a duty cycle D = 0.25 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 36 VD = 0.25
|Vo| = V
3.Medium
+−48 VLSCR = 25 Ω+−160 V

An ideal boost converter turns 48 V into 160 V for a 25 Ω load. Find the average inductor current IL.

Vin​ = 48 VVo​ = 160 VR = 25 Ω
IL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 9 V into 6.3 V for a 4 Ω load. It switches at 25 kHz with L = 220 µH. Find the peak inductor current Imax.

Vin​ = 9 VVo​ = 6.3 Vf = 25 kHzL = 220 µHR = 4 Ω
Imax = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 15 V into 10.5 V at 250 kHz with L = 100 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 15 VVo​ = 10.5 Vf = 250 kHzL = 100 µH
Io,min = A
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 24 V into 6 V at 250 kHz with L = 47 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 24 VVo​ = 6 Vf = 250 kHzL = 47 µH
Io,min = A

Answer key

  1. 1. D = 0.75
  2. 2. |Vo| = 12 V
  3. 3. IL = 21.33 A
  4. 4. Imax = 1.747 A
  5. 5. Io,min = 0.063 A
  6. 6. Io,min = 0.1915 A

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