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
+−5 VD = ?LCR+−1.5 V

An ideal buck converter must produce 1.5 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 1.5 V
D =
2.Easy
+−36 VLD = ?CR+−180 V

An ideal boost converter must produce 180 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 180 V
D =
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 48 V into 19.2 V for a 2.5 Ω load. It switches at 25 kHz with L = 150 µH. Find the peak inductor current Imax.

Vin​ = 48 VVo​ = 19.2 Vf = 25 kHzL = 150 µHR = 2.5 Ω
Imax = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 96 V at 250 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 96 Vf = 250 kHzL = 47 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 15 V into 60 V for an 8 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 15 VVo​ = 60 Vf = 50 kHzR = 8 Ω
Lcrit = µH
6.Hard
+−9 VLSC = 470 µFR = 50 Ω+−22.5 V

An ideal boost converter turns 9 V into 22.5 V for a 50 Ω load at 50 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 22.5 Vf = 50 kHzC = 470 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.3
  2. 2. D = 0.8
  3. 3. Imax = 9.216 A
  4. 4. ΔIL = 1.532 A
  5. 5. Lcrit = 3.75 µH
  6. 6. ΔVo = 11.49 mV

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