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 VD = ?LCR−+28 V

An ideal inverting buck-boost converter must produce −28 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = −28 V
D =
2.Easy
+−48 VLD = ?CR+−160 V

An ideal boost converter must produce 160 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = 160 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −8 V at 40 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −8 Vf = 40 kHzL = 33 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 24 V into 9.6 V for a 12 Ω load. It switches at 500 kHz with L = 33 µH. Find the peak inductor current Imax.

Vin​ = 24 VVo​ = 9.6 Vf = 500 kHzL = 33 µHR = 12 Ω
Imax = A
5.Hard
+−24 VSLC = 100 µFR = 25 Ω−+−56 V

An ideal buck-boost converter turns 24 V into −56 V for a 25 Ω load at 500 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −56 Vf = 500 kHzC = 100 µFR = 25 Ω
ΔVo = mV
6.Hard
+−12 VLSC = 470 µFR = 10 Ω+−30 V

An ideal boost converter turns 12 V into 30 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​ = 12 VVo​ = 30 Vf = 250 kHzC = 470 µFR = 10 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.7
  2. 2. D = 0.7
  3. 3. ΔIL = 3.636 A
  4. 4. Imax = 0.9745 A
  5. 5. ΔVo = 31.36 mV
  6. 6. ΔVo = 15.32 mV

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