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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Name: ____________________   Date: ____________

1.Easy
+−15 VD = ?LCR+−7.5 V

An ideal buck converter must produce 7.5 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 7.5 V
D =
2.Easy
+−5 VLD = ?CR+−25 V

An ideal boost converter must produce 25 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 25 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 8.4 V at 25 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 8.4 Vf = 25 kHzL = 47 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 12 V into 4.8 V at 100 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 4.8 Vf = 100 kHzL = 22 µH
ΔIL = A
5.Hard
+−24 VSL = 150 µHC = ?R+−6 V

A buck converter turns 24 V into 6 V at 25 kHz with L = 150 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 100 mV.

Vin​ = 24 VVo​ = 6 Vf = 25 kHzL = 150 µHΔVo = 100 mV
C = µF
6.Hard
+−24 VSLC = 10 µFR = 10 Ω−+−72 V

An ideal buck-boost converter turns 24 V into −72 V for a 10 Ω load at 500 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −72 Vf = 500 kHzC = 10 µFR = 10 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.5
  2. 2. D = 0.8
  3. 3. ΔIL = 2.145 A
  4. 4. ΔIL = 1.309 A
  5. 5. C = 60 µF
  6. 6. ΔVo = 1080 mV

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