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
+−24 VLSCR+−96 V

An ideal boost converter turns 24 V into 96 V and delivers 2 A to its load. Find the average input current Iin.

Vin​ = 24 VVo​ = 96 VIo = 2 A
Iin = A
2.Easy
+−5 VD = 0.6LCR+−Vo​ = ?

An ideal buck converter runs from 5 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 5 VD = 0.6
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −15 V at 20 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −15 Vf = 20 kHzL = 150 µH
ΔIL = A
4.Medium
+−48 VSL = ?CR+−33.6 V

An ideal buck converter turns 48 V into 33.6 V at a switching frequency of 200 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.8 A.

Vin​ = 48 VVo​ = 33.6 Vf = 200 kHzΔIL = 0.8 A
L = µH
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 15 V into 6 V at 500 kHz with L = 47 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 15 VVo​ = 6 Vf = 500 kHzL = 47 µH
Io,min = A
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 48 V into 80 V for a 25 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = 80 Vf = 20 kHzR = 25 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 8 A
  2. 2. Vo = 3 V
  3. 3. ΔIL = 2.5 A
  4. 4. L = 63 µH
  5. 5. Io,min = 0.0766 A
  6. 6. Lcrit = 90 µH

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