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
+−48 VD = ?LCR−+16 V

An ideal inverting buck-boost converter must produce −16 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = −16 V
D =
2.Easy
+−24 VD = 0.6LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 24 V with a duty cycle D = 0.6 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 24 VD = 0.6
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 24 V into 16.8 V at 25 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 16.8 Vf = 25 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 60 V at 40 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 60 Vf = 40 kHzL = 150 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 9 V into 15 V for a 10 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 15 Vf = 20 kHzR = 10 Ω
Lcrit = µH
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 15 V into 7.5 V at 40 kHz with L = 22 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 15 VVo​ = 7.5 Vf = 40 kHzL = 22 µH
Io,min = A

Answer key

  1. 1. D = 0.25
  2. 2. |Vo| = 36 V
  3. 3. ΔIL = 0.9164 A
  4. 4. ΔIL = 2.4 A
  5. 5. Lcrit = 36 µH
  6. 6. Io,min = 2.131 A

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