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 V

An ideal buck converter must produce 2 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 2 V
D =
2.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 =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 192 V at 50 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 192 Vf = 50 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 24 V into −36 V at 250 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = −36 Vf = 250 kHzL = 47 µH
ΔIL = A
5.Hard
+−9 VSL = 10 µHC = ?R+−3.6 V

A buck converter turns 9 V into 3.6 V at 500 kHz with L = 10 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 20 mV.

Vin​ = 9 VVo​ = 3.6 Vf = 500 kHzL = 10 µHΔVo = 20 mV
C = µF
6.Hard
+−48 VSL = 220 µHC = ?R+−19.2 V

A buck converter turns 48 V into 19.2 V at 40 kHz with L = 220 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 20 mV.

Vin​ = 48 VVo​ = 19.2 Vf = 40 kHzL = 220 µHΔVo = 20 mV
C = µF

Answer key

  1. 1. D = 0.4
  2. 2. D = 0.8
  3. 3. ΔIL = 3.273 A
  4. 4. ΔIL = 1.226 A
  5. 5. C = 5.4 µF
  6. 6. C = 204.5 µF

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