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
+−5 VD = ?LCR+−1.5 V

An ideal buck converter must produce 1.5 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 1.5 V
D =
3.Medium
+−12 VLSCR = 2.5 Ω+−30 V

An ideal boost converter turns 12 V into 30 V for a 2.5 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 30 VR = 2.5 Ω
IL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 12 V into 3.6 V for a 12 Ω load. It switches at 200 kHz with L = 100 µH. Find the peak inductor current Imax.

Vin​ = 12 VVo​ = 3.6 Vf = 200 kHzL = 100 µHR = 12 Ω
Imax = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 15 V into 7.5 V at 50 kHz with L = 220 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 15 VVo​ = 7.5 Vf = 50 kHzL = 220 µH
Io,min = A
6.Hard
+−24 VSLC = 470 µFR = 25 Ω−+−36 V

An ideal buck-boost converter turns 24 V into −36 V for a 25 Ω load at 20 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −36 Vf = 20 kHzC = 470 µFR = 25 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.5
  2. 2. D = 0.3
  3. 3. IL = 30 A
  4. 4. Imax = 0.363 A
  5. 5. Io,min = 0.1705 A
  6. 6. ΔVo = 91.91 mV

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