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−+18 V

An ideal inverting buck-boost converter must produce −18 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = −18 V
D =
2.Easy
+−9 VLD = ?CR+−30 V

An ideal boost converter must produce 30 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 30 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 16 V at 25 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 16 Vf = 25 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 48 V into 33.6 V for a 4 Ω load. It switches at 40 kHz with L = 150 µH. Find the peak inductor current Imax.

Vin​ = 48 VVo​ = 33.6 Vf = 40 kHzL = 150 µHR = 4 Ω
Imax = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 48 V into 14.4 V for an 8 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = 14.4 Vf = 500 kHzR = 8 Ω
Lcrit = µH
6.Hard
+−15 VSLC = 100 µFR = 12 Ω−+−45 V

An ideal buck-boost converter turns 15 V into −45 V for a 12 Ω load at 25 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = −45 Vf = 25 kHzC = 100 µFR = 12 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.6
  2. 2. D = 0.7
  3. 3. ΔIL = 0.5455 A
  4. 4. Imax = 9.24 A
  5. 5. Lcrit = 5.6 µH
  6. 6. ΔVo = 1125 mV

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