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
+−36 VD = ?LCR−+84 V

An ideal inverting buck-boost converter must produce −84 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = −84 V
D =
2.Easy
+−36 VSLCR+−21.6 V

An ideal buck converter turns 36 V into 21.6 V and delivers 3 A to its load. Find the average input current Iin.

Vin​ = 36 VVo​ = 21.6 VIo = 3 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −12 V at 25 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −12 Vf = 25 kHzL = 100 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 24 V into 16.8 V at 200 kHz with L = 68 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 24 VVo​ = 16.8 Vf = 200 kHzL = 68 µH
ΔIL = A
5.Hard
+−36 VLSC = 100 µFR = 5 Ω+−144 V

An ideal boost converter turns 36 V into 144 V for a 5 Ω load at 500 kHz. The output capacitor is 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 144 Vf = 500 kHzC = 100 µFR = 5 Ω
ΔVo = mV
6.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 9 V into 3.6 V at 40 kHz with L = 33 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 9 VVo​ = 3.6 Vf = 40 kHzL = 33 µH
Io,min = A

Answer key

  1. 1. D = 0.7
  2. 2. Iin = 1.8 A
  3. 3. ΔIL = 2.4 A
  4. 4. ΔIL = 0.3706 A
  5. 5. ΔVo = 432 mV
  6. 6. Io,min = 0.8182 A

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