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 VLD = ?CR+−80 V

An ideal boost converter must produce 80 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = 80 V
D =
2.Easy
+−5 VD = ?LCR+−2.5 V

An ideal buck converter must produce 2.5 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 2.5 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 48 V into −48 V at 25 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = −48 Vf = 25 kHzL = 330 µH
ΔIL = A
4.Medium
+−12 VSL = ?CR+−9 V

An ideal buck converter turns 12 V into 9 V at a switching frequency of 20 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.6 A.

Vin​ = 12 VVo​ = 9 Vf = 20 kHzΔIL = 0.6 A
L = µH
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 24 V into 18 V for a 12 Ω load at 40 kHz, with L = 100 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = 18 Vf = 40 kHzL = 100 µHC = 220 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 12 V into 16 V for a 5 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = 16 Vf = 50 kHzR = 5 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.4
  2. 2. D = 0.5
  3. 3. ΔIL = 2.909 A
  4. 4. L = 187.5 µH
  5. 5. ΔVo = 15.98 mV
  6. 6. Lcrit = 7.031 µH

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