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 VLD = ?CR+−60 V

An ideal boost converter must produce 60 V from 12 V in continuous conduction. Find the duty cycle D.

Vin​ = 12 VVo​ = 60 V
D =
2.Easy
+−5 VD = ?LCR+−1.5 V

An ideal buck converter must produce 1.5 V from 5 V in continuous conduction. Find the duty cycle D.

Vin​ = 5 VVo​ = 1.5 V
D =
3.Medium
+−15 VLSCR = 10 Ω+−30 V

An ideal boost converter turns 15 V into 30 V for a 10 Ω load. Find the average inductor current IL.

Vin​ = 15 VVo​ = 30 VR = 10 Ω
IL = A
4.Medium
+−24 VLSCR = 5 Ω+−60 V

An ideal boost converter turns 24 V into 60 V for a 5 Ω load. Find the average inductor current IL.

Vin​ = 24 VVo​ = 60 VR = 5 Ω
IL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 9 V into 6.3 V at 50 kHz with L = 150 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 9 VVo​ = 6.3 Vf = 50 kHzL = 150 µH
Io,min = A
6.Hard
+−36 VSL = 100 µHC = ?R+−21.6 V

A buck converter turns 36 V into 21.6 V at 50 kHz with L = 100 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 5 mV.

Vin​ = 36 VVo​ = 21.6 Vf = 50 kHzL = 100 µHΔVo = 5 mV
C = µF

Answer key

  1. 1. D = 0.8
  2. 2. D = 0.3
  3. 3. IL = 6 A
  4. 4. IL = 30 A
  5. 5. Io,min = 0.126 A
  6. 6. C = 864 µF

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