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
+−9 VLD = 0.4CR+−Vo​ = ?

An ideal boost converter runs from 9 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 9 VD = 0.4
Vo = V
2.Easy
+−5 VSLCR+−2 V

An ideal buck converter turns 5 V into 2 V and delivers 1 A to its load. Find the average input current Iin.

Vin​ = 5 VVo​ = 2 VIo = 1 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −8 V at 25 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −8 Vf = 25 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 24 V into −72 V at 500 kHz with L = 220 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = −72 Vf = 500 kHzL = 220 µH
ΔIL = A
5.Hard
+−36 VSLC = 470 µFR = 25 Ω−+−54 V

An ideal buck-boost converter turns 36 V into −54 V for a 25 Ω load at 100 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = −54 Vf = 100 kHzC = 470 µFR = 25 Ω
ΔVo = mV
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 36 V into 27 V at 50 kHz with L = 220 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 36 VVo​ = 27 Vf = 50 kHzL = 220 µH
Io,min = A

Answer key

  1. 1. Vo = 15 V
  2. 2. Iin = 0.4 A
  3. 3. ΔIL = 1.28 A
  4. 4. ΔIL = 0.1636 A
  5. 5. ΔVo = 27.57 mV
  6. 6. Io,min = 0.3068 A

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