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
+−5 VD = 0.75LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 5 V with a duty cycle D = 0.75 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 5 VD = 0.75
|Vo| = V
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 36 V into 27 V for a 2.5 Ω load. It switches at 25 kHz with L = 150 µH. Find the peak inductor current Imax.

Vin​ = 36 VVo​ = 27 Vf = 25 kHzL = 150 µHR = 2.5 Ω
Imax = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 32 V at 40 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 32 Vf = 40 kHzL = 150 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 15 V into 60 V for an 8 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = 60 Vf = 100 kHzR = 8 Ω
Lcrit = µH
6.Hard
+−48 VLSC = 10 µFR = 2 Ω+−80 V

An ideal boost converter turns 48 V into 80 V for a 2 Ω load at 20 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 80 Vf = 20 kHzC = 10 µFR = 2 Ω
ΔVo = mV

Answer key

  1. 1. |Vo| = 7.5 V
  2. 2. |Vo| = 15 V
  3. 3. Imax = 11.7 A
  4. 4. ΔIL = 1 A
  5. 5. Lcrit = 1.875 µH
  6. 6. ΔVo = 80000 mV

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