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+−14.4 V

An ideal buck converter must produce 14.4 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = 14.4 V
D =
2.Easy
+−36 VLD = ?CR+−144 V

An ideal boost converter must produce 144 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 144 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −4 V at 40 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −4 Vf = 40 kHzL = 100 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 36 V into −12 V at 20 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = −12 Vf = 20 kHzL = 220 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 9 V for a 50 Ω load at 25 kHz, with L = 330 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 9 Vf = 25 kHzL = 330 µHC = 470 µF
ΔVo = mV
6.Hard
+−24 VLSC = 470 µFR = 25 Ω+−60 V

An ideal boost converter turns 24 V into 60 V for a 25 Ω load at 500 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 60 Vf = 500 kHzC = 470 µFR = 25 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.3
  2. 2. D = 0.75
  3. 3. ΔIL = 0.75 A
  4. 4. ΔIL = 2.045 A
  5. 5. ΔVo = 2.901 mV
  6. 6. ΔVo = 6.128 mV

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