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 VLD = ?CR+−75 V

An ideal boost converter must produce 75 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 75 V
D =
2.Easy
+−48 VD = ?LCR−+48 V

An ideal inverting buck-boost converter must produce −48 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = −48 V
D =
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 48 V into 19.2 V for a 25 Ω load. It switches at 500 kHz with L = 330 µH. Find the peak inductor current Imax.

Vin​ = 48 VVo​ = 19.2 Vf = 500 kHzL = 330 µHR = 25 Ω
Imax = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 20 V at 200 kHz with L = 10 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 20 Vf = 200 kHzL = 10 µH
ΔIL = A
5.Hard
+−48 VSLC = 470 µFR = 10 Ω−+−72 V

An ideal buck-boost converter turns 48 V into −72 V for a 10 Ω load at 250 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = −72 Vf = 250 kHzC = 470 µFR = 10 Ω
ΔVo = mV
6.Hard
+−24 VLSC = 220 µFR = 12 Ω+−32 V

An ideal boost converter turns 24 V into 32 V for a 12 Ω load at 40 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 32 Vf = 40 kHzC = 220 µFR = 12 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.8
  2. 2. D = 0.5
  3. 3. Imax = 0.8029 A
  4. 4. ΔIL = 2.4 A
  5. 5. ΔVo = 36.77 mV
  6. 6. ΔVo = 75.76 mV

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