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
+−9 VD = ?LCR+−7.2 V

An ideal buck converter must produce 7.2 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 7.2 V
D =
2.Easy
+−5 VLD = ?CR+−10 V

An ideal boost converter must produce 10 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 10 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 15 V into 30 V at 50 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 30 Vf = 50 kHzL = 68 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 36 V into 48 V at 40 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 48 Vf = 40 kHzL = 330 µH
ΔIL = A
5.Hard
+−15 VLSC = 10 µFR = 10 Ω+−20 V

An ideal boost converter turns 15 V into 20 V for a 10 Ω load at 40 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 20 Vf = 40 kHzC = 10 µFR = 10 Ω
ΔVo = mV
6.Hard
+−9 VLSC = 47 µFR = 50 Ω+−12 V

An ideal boost converter turns 9 V into 12 V for a 50 Ω load at 20 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 12 Vf = 20 kHzC = 47 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.8
  2. 2. D = 0.5
  3. 3. ΔIL = 2.206 A
  4. 4. ΔIL = 0.6818 A
  5. 5. ΔVo = 1250 mV
  6. 6. ΔVo = 63.83 mV

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