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
+−48 VD = ?LCR+−28.8 V

An ideal buck converter must produce 28.8 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = 28.8 V
D =
2.Easy
+−9 VLD = 0.5CR+−Vo​ = ?

An ideal boost converter runs from 9 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.5
Vo = V
3.Medium
+−9 VLSCR = 2 Ω+−22.5 V

An ideal boost converter turns 9 V into 22.5 V for a 2 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 22.5 VR = 2 Ω
IL = A
4.Medium
+−48 VLSCR = 15 Ω+−80 V

An ideal boost converter turns 48 V into 80 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 48 VVo​ = 80 VR = 15 Ω
IL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 9 V into −9 V for a 2 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = −9 Vf = 50 kHzR = 2 Ω
Lcrit = µH
6.Hard
+−24 VLSC = 220 µFR = 8 Ω+−60 V

An ideal boost converter turns 24 V into 60 V for an 8 Ω load at 40 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 60 Vf = 40 kHzC = 220 µFR = 8 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.6
  2. 2. Vo = 18 V
  3. 3. IL = 28.13 A
  4. 4. IL = 8.889 A
  5. 5. Lcrit = 5 µH
  6. 6. ΔVo = 511.4 mV

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