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
+−24 VD = ?LCR+−14.4 V

An ideal buck converter must produce 14.4 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 14.4 V
D =
2.Easy
+−24 VD = ?LCR+−19.2 V

An ideal buck converter must produce 19.2 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 19.2 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 15 V into 25 V at 40 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 25 Vf = 40 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 80 V at 40 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 80 Vf = 40 kHzL = 150 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 12 V into 3.6 V for a 10 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 3.6 Vf = 200 kHzR = 10 Ω
Lcrit = µH
6.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 9 V into 2.7 V for a 2 Ω load at 50 kHz, with L = 68 µH and C = 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 2.7 Vf = 50 kHzL = 68 µHC = 47 µF
ΔVo = mV

Answer key

  1. 1. D = 0.6
  2. 2. D = 0.8
  3. 3. ΔIL = 1 A
  4. 4. ΔIL = 3.2 A
  5. 5. Lcrit = 17.5 µH
  6. 6. ΔVo = 29.57 mV

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