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 = 0.4LCR+−Vo​ = ?

An ideal buck converter runs from 9 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.4
Vo = V
2.Easy
+−9 VD = 0.8LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 9 V with a duty cycle D = 0.8 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 9 VD = 0.8
|Vo| = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 80 V at 200 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 80 Vf = 200 kHzL = 68 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 15 V into 4.5 V for a 2.5 Ω load. It switches at 200 kHz with L = 22 µH. Find the peak inductor current Imax.

Vin​ = 15 VVo​ = 4.5 Vf = 200 kHzL = 22 µHR = 2.5 Ω
Imax = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 15 V into −10 V for a 5 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = −10 Vf = 20 kHzR = 5 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 24 V into −56 V for a 12 Ω load at 40 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = −56 Vf = 40 kHzR = 12 Ω
Lcrit = µH

Answer key

  1. 1. Vo = 3.6 V
  2. 2. |Vo| = 36 V
  3. 3. ΔIL = 1.235 A
  4. 4. Imax = 2.158 A
  5. 5. Lcrit = 45 µH
  6. 6. Lcrit = 13.5 µH

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