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
+−5 VD = 0.6LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.6 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.6
|Vo| = V
2.Easy
+−5 VD = 0.8LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.8 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.8
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 96 V at 100 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 96 Vf = 100 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 15 V into 10.5 V for a 2.5 Ω load. It switches at 200 kHz with L = 10 µH. Find the peak inductor current Imax.

Vin​ = 15 VVo​ = 10.5 Vf = 200 kHzL = 10 µHR = 2.5 Ω
Imax = A
5.Hard
+−9 VSL = 100 µHC = ?R+−4.5 V

A buck converter turns 9 V into 4.5 V at 200 kHz with L = 100 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 25 mV.

Vin​ = 9 VVo​ = 4.5 Vf = 200 kHzL = 100 µHΔVo = 25 mV
C = µF
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 12 V into 4.8 V at 200 kHz with L = 330 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 12 VVo​ = 4.8 Vf = 200 kHzL = 330 µH
Io,min = A

Answer key

  1. 1. |Vo| = 7.5 V
  2. 2. |Vo| = 20 V
  3. 3. ΔIL = 1.091 A
  4. 4. Imax = 4.987 A
  5. 5. C = 2.813 µF
  6. 6. Io,min = 0.02182 A

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