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 VLD = 0.7CR+−Vo​ = ?

An ideal boost converter runs from 15 V with a duty cycle D = 0.7 in continuous conduction. Find the output voltage Vo.

Vin​ = 15 VD = 0.7
Vo = V
2.Easy
+−24 VLD = 0.8CR+−Vo​ = ?

An ideal boost converter runs from 24 V with a duty cycle D = 0.8 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.8
Vo = V
3.Medium
+−24 VLSCR = 15 Ω+−80 V

An ideal boost converter turns 24 V into 80 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 80 VR = 15 Ω
IL = A
4.Medium
+−48 VSL = ?CR+−33.6 V

An ideal buck converter turns 48 V into 33.6 V at a switching frequency of 50 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.8 A.

Vin​ = 48 VVo​ = 33.6 Vf = 50 kHzΔIL = 0.8 A
L = µH
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 36 V into −24 V for a 25 Ω load at 25 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = −24 Vf = 25 kHzR = 25 Ω
Lcrit = µH
6.Hard
+−48 VSLC = 10 µFR = 50 Ω−+−48 V

An ideal buck-boost converter turns 48 V into −48 V for a 50 Ω load at 25 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = −48 Vf = 25 kHzC = 10 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 50 V
  2. 2. Vo = 120 V
  3. 3. IL = 17.78 A
  4. 4. L = 252 µH
  5. 5. Lcrit = 180 µH
  6. 6. ΔVo = 1920 mV

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