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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Name: ____________________   Date: ____________

1.Easy
+−48 VD = ?LCR+−38.4 V

An ideal buck converter must produce 38.4 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = 38.4 V
D =
2.Easy
+−15 VD = ?LCR+−6 V

An ideal buck converter must produce 6 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 6 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 24 V at 25 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 24 Vf = 25 kHzL = 220 µH
ΔIL = A
4.Medium
+−9 VLSCR = 15 Ω+−22.5 V

An ideal boost converter turns 9 V into 22.5 V for a 15 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 22.5 VR = 15 Ω
IL = A
5.Hard
+−24 VSL = 10 µHC = ?R+−9.6 V

A buck converter turns 24 V into 9.6 V at 200 kHz with L = 10 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 20 mV.

Vin​ = 24 VVo​ = 9.6 Vf = 200 kHzL = 10 µHΔVo = 20 mV
C = µF
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 24 V into 18 V for a 12 Ω load at 500 kHz, with L = 22 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 18 Vf = 500 kHzL = 22 µHC = 220 µF
ΔVo = mV

Answer key

  1. 1. D = 0.8
  2. 2. D = 0.4
  3. 3. ΔIL = 1.091 A
  4. 4. IL = 3.75 A
  5. 5. C = 90 µF
  6. 6. ΔVo = 0.4649 mV

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