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 VSLCR−+72 V

An ideal buck-boost converter turns 24 V into 72 V and delivers 2 A to its load. Find the average input current Iin.

Vin​ = 24 VVo​ = 72 VIo = 2 A
Iin = A
2.Easy
+−48 VD = 0.6LCR+−Vo​ = ?

An ideal buck converter runs from 48 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 48 VD = 0.6
Vo = V
3.Medium
+−12 VSL = ?CR+−7.2 V

An ideal buck converter turns 12 V into 7.2 V at a switching frequency of 100 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.5 A.

Vin​ = 12 VVo​ = 7.2 Vf = 100 kHzΔIL = 0.5 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 24 V into 40 V at 25 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 40 Vf = 25 kHzL = 150 µH
ΔIL = A
5.Hard
+−12 VLSC = 100 µFR = 4 Ω+−16 V

An ideal boost converter turns 12 V into 16 V for a 4 Ω load at 20 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 16 Vf = 20 kHzC = 100 µFR = 4 Ω
ΔVo = mV
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 12 V into 8.4 V at 25 kHz with L = 330 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 12 VVo​ = 8.4 Vf = 25 kHzL = 330 µH
Io,min = A

Answer key

  1. 1. Iin = 6 A
  2. 2. Vo = 28.8 V
  3. 3. L = 57.6 µH
  4. 4. ΔIL = 2.56 A
  5. 5. ΔVo = 500 mV
  6. 6. Io,min = 0.1527 A

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