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 VLSCR+−120 V

An ideal boost converter turns 48 V into 120 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 48 VVo​ = 120 VIo = 5 A
Iin = A
2.Easy
+−36 VD = 0.5LCR+−Vo​ = ?

An ideal buck converter runs from 36 V with a duty cycle D = 0.5 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.5
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 5.4 V at 20 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 5.4 Vf = 20 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 21.6 V at 25 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 21.6 Vf = 25 kHzL = 100 µH
ΔIL = A
5.Hard
+−9 VSLC = 22 µFR = 12 Ω−+−3 V

An ideal buck-boost converter turns 9 V into −3 V for a 12 Ω load at 200 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = −3 Vf = 200 kHzC = 22 µFR = 12 Ω
ΔVo = mV
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 48 V into 24 V at 250 kHz with L = 330 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 48 VVo​ = 24 Vf = 250 kHzL = 330 µH
Io,min = A

Answer key

  1. 1. Iin = 12.5 A
  2. 2. Vo = 18 V
  3. 3. ΔIL = 0.72 A
  4. 4. ΔIL = 3.456 A
  5. 5. ΔVo = 14.2 mV
  6. 6. Io,min = 0.07273 A

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