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
+−36 VLD = ?CR+−45 V

An ideal boost converter must produce 45 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 45 V
D =
2.Easy
+−15 VSLCR+−9 V

An ideal buck converter turns 15 V into 9 V and delivers 1 A to its load. Find the average input current Iin.

Vin​ = 15 VVo​ = 9 VIo = 1 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 9 V into 22.5 V at 50 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 22.5 Vf = 50 kHzL = 68 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 6.3 V at 200 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 6.3 Vf = 200 kHzL = 47 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 12 V into −4 V for a 2 Ω load at 50 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 12 VVo​ = −4 Vf = 50 kHzR = 2 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 9 V into 12 V for an 8 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 9 VVo​ = 12 Vf = 20 kHzR = 8 Ω
Lcrit = µH

Answer key

  1. 1. D = 0.2
  2. 2. Iin = 0.6 A
  3. 3. ΔIL = 1.588 A
  4. 4. ΔIL = 0.2011 A
  5. 5. Lcrit = 11.25 µH
  6. 6. Lcrit = 28.13 µH

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