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
+−15 VD = ?LCR+−7.5 V

An ideal buck converter must produce 7.5 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 7.5 V
D =
2.Easy
+−15 VD = ?LCR+−3 V

An ideal buck converter must produce 3 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 3 V
D =
3.Medium
+−12 VLSCR = 2.5 Ω+−24 V

An ideal boost converter turns 12 V into 24 V for a 2.5 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 24 VR = 2.5 Ω
IL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 15 V into 7.5 V for a 10 Ω load. It switches at 250 kHz with L = 22 µH. Find the peak inductor current Imax.

Vin​ = 15 VVo​ = 7.5 Vf = 250 kHzL = 22 µHR = 10 Ω
Imax = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 12 V into 48 V for a 10 Ω load at 250 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 48 Vf = 250 kHzR = 10 Ω
Lcrit = µH
6.Hard
+−15 VSLC = 22 µFR = 12 Ω−+−45 V

An ideal buck-boost converter turns 15 V into −45 V for a 12 Ω load at 100 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = −45 Vf = 100 kHzC = 22 µFR = 12 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.5
  2. 2. D = 0.2
  3. 3. IL = 19.2 A
  4. 4. Imax = 1.091 A
  5. 5. Lcrit = 0.9375 µH
  6. 6. ΔVo = 1278 mV

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