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
+−15 VLD = ?CR+−25 V

An ideal boost converter must produce 25 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 25 V
D =
2.Easy
+−15 VSLCR+−7.5 V

An ideal buck converter turns 15 V into 7.5 V and delivers 4 A to its load. Find the average input current Iin.

Vin​ = 15 VVo​ = 7.5 VIo = 4 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 96 V at 50 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 96 Vf = 50 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 33.6 V at 250 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 33.6 Vf = 250 kHzL = 100 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 9 V into 4.5 V for a 10 Ω load at 20 kHz, with L = 220 µH and C = 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = 4.5 Vf = 20 kHzL = 220 µHC = 220 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 36 V into −24 V for an 8 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = −24 Vf = 50 kHzR = 8 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.4
  2. 2. Iin = 2 A
  3. 3. ΔIL = 2.182 A
  4. 4. ΔIL = 0.4032 A
  5. 5. ΔVo = 14.53 mV
  6. 6. Lcrit = 28.8 µH

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