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 VD = ?LCR−+24 V

An ideal inverting buck-boost converter must produce −24 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = −24 V
D =
2.Easy
+−12 VD = 0.6LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 12 V with a duty cycle D = 0.6 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 12 VD = 0.6
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 40 V at 40 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 40 Vf = 40 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 48 V into −72 V at 25 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = −72 Vf = 25 kHzL = 330 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 36 V into −36 V for a 5 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = −36 Vf = 500 kHzR = 5 Ω
Lcrit = µH
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 36 V into 9 V at 200 kHz with L = 150 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 36 VVo​ = 9 Vf = 200 kHzL = 150 µH
Io,min = A

Answer key

  1. 1. D = 0.4
  2. 2. |Vo| = 18 V
  3. 3. ΔIL = 0.9545 A
  4. 4. ΔIL = 3.491 A
  5. 5. Lcrit = 1.25 µH
  6. 6. Io,min = 0.1125 A

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