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
+−48 VD = 0.5LCR+−Vo​ = ?

An ideal buck converter runs from 48 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 48 VD = 0.5
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 48 V at 250 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 48 Vf = 250 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 36 V into 60 V at 25 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 60 Vf = 25 kHzL = 330 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 9 V into 2.7 V for a 5 Ω load at 25 kHz, with L = 150 µH and C = 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 2.7 Vf = 25 kHzL = 150 µHC = 47 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 36 V into 27 V for a 20 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = 27 Vf = 500 kHzR = 20 Ω
Lcrit = µH

Answer key

  1. 1. |Vo| = 7.5 V
  2. 2. Vo = 24 V
  3. 3. ΔIL = 0.1636 A
  4. 4. ΔIL = 1.745 A
  5. 5. ΔVo = 53.62 mV
  6. 6. Lcrit = 5 µH

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