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
+−48 VD = 0.25LCR+−Vo​ = ?

An ideal buck converter runs from 48 V with a duty cycle D = 0.25 in continuous conduction. Find the output voltage Vo.

Vin​ = 48 VD = 0.25
Vo = V
2.Easy
+−9 VD = ?LCR+−7.2 V

An ideal buck converter must produce 7.2 V from 9 V in continuous conduction. Find the duty cycle D.

Vin​ = 9 VVo​ = 7.2 V
D =
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 36 V into 10.8 V for a 5 Ω load. It switches at 40 kHz with L = 220 µH. Find the peak inductor current Imax.

Vin​ = 36 VVo​ = 10.8 Vf = 40 kHzL = 220 µHR = 5 Ω
Imax = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −22.5 V at 50 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −22.5 Vf = 50 kHzL = 330 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 15 V into 7.5 V for a 10 Ω load at 100 kHz, with L = 68 µH and C = 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 7.5 Vf = 100 kHzL = 68 µHC = 10 µF
ΔVo = mV
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 48 V into 24 V for a 4 Ω load at 40 kHz, with L = 150 µH and C = 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 24 Vf = 40 kHzL = 150 µHC = 47 µF
ΔVo = mV

Answer key

  1. 1. Vo = 12 V
  2. 2. D = 0.8
  3. 3. Imax = 2.59 A
  4. 4. ΔIL = 0.5455 A
  5. 5. ΔVo = 68.93 mV
  6. 6. ΔVo = 133 mV

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