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
+−12 VLSCR+−48 V

An ideal boost converter turns 12 V into 48 V and delivers 1 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 48 VIo = 1 A
Iin = A
2.Easy
+−12 VD = 0.45LCR+−Vo​ = ?

An ideal buck converter runs from 12 V with a duty cycle D = 0.45 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.45
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 48 V into 120 V at 40 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 120 Vf = 40 kHzL = 220 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 24 V at 100 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 24 Vf = 100 kHzL = 47 µH
ΔIL = A
5.Hard
+−9 VSL = 220 µHC = ?R+−5.4 V

A buck converter turns 9 V into 5.4 V at 25 kHz with L = 220 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 100 mV.

Vin​ = 9 VVo​ = 5.4 Vf = 25 kHzL = 220 µHΔVo = 100 mV
C = µF
6.Hard
+−15 VSL = 220 µHC = ?R+−4.5 V

A buck converter turns 15 V into 4.5 V at 40 kHz with L = 220 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 100 mV.

Vin​ = 15 VVo​ = 4.5 Vf = 40 kHzL = 220 µHΔVo = 100 mV
C = µF

Answer key

  1. 1. Iin = 4 A
  2. 2. Vo = 5.4 V
  3. 3. ΔIL = 3.273 A
  4. 4. ΔIL = 1.277 A
  5. 5. C = 19.64 µF
  6. 6. C = 11.19 µF

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