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 = 0.25LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 9 V with a duty cycle D = 0.25 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 9 VD = 0.25
|Vo| = V
2.Easy
+−15 VD = ?LCR+−3 V

An ideal buck converter must produce 3 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 3 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 4.8 V at 20 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 4.8 Vf = 20 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 24 V into 14.4 V at 20 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 14.4 Vf = 20 kHzL = 220 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 9 V for a 5 Ω load at 20 kHz, with L = 330 µH and C = 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 9 Vf = 20 kHzL = 330 µHC = 100 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 9 V into 3.6 V for a 10 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 3.6 Vf = 250 kHzR = 10 Ω
Lcrit = µH

Answer key

  1. 1. |Vo| = 3 V
  2. 2. D = 0.2
  3. 3. ΔIL = 0.96 A
  4. 4. ΔIL = 1.309 A
  5. 5. ΔVo = 21.31 mV
  6. 6. Lcrit = 12 µH

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