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 VSLCR+−9 V

An ideal buck converter turns 12 V into 9 V and delivers 1.5 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 9 VIo = 1.5 A
Iin = A
2.Easy
+−24 VD = ?LCR−+8 V

An ideal inverting buck-boost converter must produce −8 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = −8 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 15 V into 37.5 V at 20 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 37.5 Vf = 20 kHzL = 330 µH
ΔIL = A
4.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 12 V into 9 V for a 12 Ω load. It switches at 250 kHz with L = 33 µH. Find the peak inductor current Imax.

Vin​ = 12 VVo​ = 9 Vf = 250 kHzL = 33 µHR = 12 Ω
Imax = A
5.Hard
+−48 VSL = 100 µHC = ?R+−12 V

A buck converter turns 48 V into 12 V at 25 kHz with L = 100 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 50 mV.

Vin​ = 48 VVo​ = 12 Vf = 25 kHzL = 100 µHΔVo = 50 mV
C = µF
6.Hard
+−36 VSLC = 10 µFR = 5 Ω−+−24 V

An ideal buck-boost converter turns 36 V into −24 V for a 5 Ω load at 25 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = −24 Vf = 25 kHzC = 10 µFR = 5 Ω
ΔVo = mV

Answer key

  1. 1. Iin = 1.125 A
  2. 2. D = 0.25
  3. 3. ΔIL = 1.364 A
  4. 4. Imax = 0.8864 A
  5. 5. C = 360 µF
  6. 6. ΔVo = 7680 mV

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