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
+−12 VLD = ?CR+−48 V

An ideal boost converter must produce 48 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = 48 V
D =
2.Easy
+−9 VLSCR+−15 V

An ideal boost converter turns 9 V into 15 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 9 VVo​ = 15 VIo = 5 A
Iin = A
3.Medium
+−48 VSL = ?CR+−33.6 V

An ideal buck converter turns 48 V into 33.6 V at a switching frequency of 50 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.2 A.

Vin​ = 48 VVo​ = 33.6 Vf = 50 kHzΔIL = 0.2 A
L = µH
4.Medium
+−24 VLSCR = 25 Ω+−60 V

An ideal boost converter turns 24 V into 60 V for a 25 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 60 VR = 25 Ω
IL = A
5.Hard
+−48 VSLC = 100 µFR = 50 Ω−+−48 V

An ideal buck-boost converter turns 48 V into −48 V for a 50 Ω load at 20 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = −48 Vf = 20 kHzC = 100 µFR = 50 Ω
ΔVo = mV
6.Hard
+−12 VLSC = 470 µFR = 20 Ω+−40 V

An ideal boost converter turns 12 V into 40 V for a 20 Ω load at 25 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 40 Vf = 25 kHzC = 470 µFR = 20 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.75
  2. 2. Iin = 8.333 A
  3. 3. L = 1008 µH
  4. 4. IL = 6 A
  5. 5. ΔVo = 240 mV
  6. 6. ΔVo = 119.1 mV

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