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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Name: ____________________   Date: ____________

1.Easy
+−15 VD = ?LCR+−9 V

An ideal buck converter must produce 9 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 9 V
D =
2.Easy
+−24 VSLCR−+36 V

An ideal buck-boost converter turns 24 V into 36 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 24 VVo​ = 36 VIo = 5 A
Iin = A
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 48 V into 24 V for a 15 Ω load. It switches at 20 kHz with L = 330 µH. Find the peak inductor current Imax.

Vin​ = 48 VVo​ = 24 Vf = 20 kHzL = 330 µHR = 15 Ω
Imax = A
4.Medium
+−9 VLSCR = 2.5 Ω+−18 V

An ideal boost converter turns 9 V into 18 V for a 2.5 Ω load. Find the average inductor current IL.

Vin​ = 9 VVo​ = 18 VR = 2.5 Ω
IL = A
5.Hard
tiL​Imax​Io​DTT2T

A buck converter turns 12 V into 8.4 V at 20 kHz with L = 47 µH. Find the smallest load current Io,min for which it stays in continuous conduction.

Vin​ = 12 VVo​ = 8.4 Vf = 20 kHzL = 47 µH
Io,min = A
6.Hard
+−36 VSLC = 10 µFR = 8 Ω−+−12 V

An ideal buck-boost converter turns 36 V into −12 V for an 8 Ω load at 40 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = −12 Vf = 40 kHzC = 10 µFR = 8 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.6
  2. 2. Iin = 7.5 A
  3. 3. Imax = 2.509 A
  4. 4. IL = 14.4 A
  5. 5. Io,min = 1.34 A
  6. 6. ΔVo = 937.5 mV

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