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
+−5 VD = ?LCR+−2.5 V

An ideal buck converter must produce 2.5 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 2.5 V
D =
2.Easy
+−36 VLD = ?CR+−45 V

An ideal boost converter must produce 45 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 45 V
D =
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 36 V into 21.6 V for an 8 Ω load. It switches at 50 kHz with L = 330 µH. Find the peak inductor current Imax.

Vin​ = 36 VVo​ = 21.6 Vf = 50 kHzL = 330 µHR = 8 Ω
Imax = A
4.Medium
+−15 VLSCR = 2 Ω+−20 V

An ideal boost converter turns 15 V into 20 V for a 2 Ω load. Find the average inductor current IL.

Vin​ = 15 VVo​ = 20 VR = 2 Ω
IL = A
5.Hard
+−48 VSLC = 100 µFR = 12 Ω−+−72 V

An ideal buck-boost converter turns 48 V into −72 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​ = 48 VVo​ = −72 Vf = 25 kHzC = 100 µFR = 12 Ω
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 48 V into 192 V for a 12 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = 192 Vf = 25 kHzR = 12 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.5
  2. 2. D = 0.2
  3. 3. Imax = 2.962 A
  4. 4. IL = 13.33 A
  5. 5. ΔVo = 1440 mV
  6. 6. Lcrit = 11.25 µH

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