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
+−9 VD = 0.8LCR+−Vo​ = ?

An ideal buck converter runs from 9 V with a duty cycle D = 0.8 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.8
Vo = V
2.Easy
+−12 VD = ?LCR+−5.4 V

An ideal buck converter must produce 5.4 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = 5.4 V
D =
3.Medium
+−12 VLSCR = 25 Ω+−20 V

An ideal boost converter turns 12 V into 20 V for a 25 Ω load. Find the average inductor current IL.

Vin​ = 12 VVo​ = 20 VR = 25 Ω
IL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −22.5 V at 500 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −22.5 Vf = 500 kHzL = 22 µH
ΔIL = A
5.Hard
+−24 VSLC = 10 µFR = 5 Ω−+−16 V

An ideal buck-boost converter turns 24 V into −16 V for a 5 Ω load at 50 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −16 Vf = 50 kHzC = 10 µFR = 5 Ω
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 48 V into 28.8 V for a 5 Ω load at 250 kHz, with L = 47 µH and C = 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 28.8 Vf = 250 kHzL = 47 µHC = 10 µF
ΔVo = mV

Answer key

  1. 1. Vo = 7.2 V
  2. 2. D = 0.45
  3. 3. IL = 1.333 A
  4. 4. ΔIL = 0.8182 A
  5. 5. ΔVo = 2560 mV
  6. 6. ΔVo = 49.02 mV

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