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 VLD = 0.6CR+−Vo​ = ?

An ideal boost converter runs from 5 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 5 VD = 0.6
Vo = V
2.Easy
+−9 VLD = ?CR+−36 V

An ideal boost converter must produce 36 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 36 V
D =
3.Medium
+−12 VSL = ?CR+−6 V

An ideal buck converter turns 12 V into 6 V at a switching frequency of 25 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.5 A.

Vin​ = 12 VVo​ = 6 Vf = 25 kHzΔIL = 0.5 A
L = µH
4.Medium
+−9 VSL = ?CR+−6.3 V

An ideal buck converter turns 9 V into 6.3 V at a switching frequency of 500 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.8 A.

Vin​ = 9 VVo​ = 6.3 Vf = 500 kHzΔIL = 0.8 A
L = µH
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 36 V into 9 V for a 10 Ω load at 20 kHz, with L = 330 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 9 Vf = 20 kHzL = 330 µHC = 470 µF
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 48 V into 24 V for a 4 Ω load at 100 kHz, with L = 220 µH and C = 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 24 Vf = 100 kHzL = 220 µHC = 100 µF
ΔVo = mV

Answer key

  1. 1. Vo = 12.5 V
  2. 2. D = 0.75
  3. 3. L = 240 µH
  4. 4. L = 4.725 µH
  5. 5. ΔVo = 13.6 mV
  6. 6. ΔVo = 6.818 mV

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