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
+−24 VLD = 0.5CR+−Vo​ = ?

An ideal boost converter runs from 24 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 24 VD = 0.5
Vo = V
2.Easy
+−36 VLD = ?CR+−90 V

An ideal boost converter must produce 90 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 90 V
D =
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 48 V into 36 V for a 12 Ω load. It switches at 100 kHz with L = 150 µH. Find the peak inductor current Imax.

Vin​ = 48 VVo​ = 36 Vf = 100 kHzL = 150 µHR = 12 Ω
Imax = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 9 V into 22.5 V at 200 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 22.5 Vf = 200 kHzL = 100 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 24 V into 14.4 V for a 5 Ω load at 200 kHz, with L = 100 µH and C = 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 14.4 Vf = 200 kHzL = 100 µHC = 47 µF
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 9 V for an 8 Ω load at 25 kHz, with L = 150 µH and C = 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 9 Vf = 25 kHzL = 150 µHC = 100 µF
ΔVo = mV

Answer key

  1. 1. Vo = 48 V
  2. 2. D = 0.6
  3. 3. Imax = 3.3 A
  4. 4. ΔIL = 0.27 A
  5. 5. ΔVo = 3.83 mV
  6. 6. ΔVo = 30 mV

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