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
+−15 VLD = ?CR+−75 V

An ideal boost converter must produce 75 V from 15 V in continuous conduction. Find the duty cycle D.

Vin​ = 15 VVo​ = 75 V
D =
2.Easy
+−24 VD = ?LCR+−19.2 V

An ideal buck converter must produce 19.2 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = 19.2 V
D =
3.Medium
+−9 VSL = ?CR+−3.6 V

An ideal buck converter turns 9 V into 3.6 V at a switching frequency of 40 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.3 A.

Vin​ = 9 VVo​ = 3.6 Vf = 40 kHzΔIL = 0.3 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 36 V at 25 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 36 Vf = 25 kHzL = 100 µH
ΔIL = A
5.Hard
+−48 VSL = 68 µHC = ?R+−28.8 V

A buck converter turns 48 V into 28.8 V at 100 kHz with L = 68 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 50 mV.

Vin​ = 48 VVo​ = 28.8 Vf = 100 kHzL = 68 µHΔVo = 50 mV
C = µF
6.Hard
+−24 VSLC = 47 µFR = 4 Ω−+−16 V

An ideal buck-boost converter turns 24 V into −16 V for a 4 Ω load at 250 kHz. The output capacitor is 47 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −16 Vf = 250 kHzC = 47 µFR = 4 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.8
  2. 2. D = 0.8
  3. 3. L = 180 µH
  4. 4. ΔIL = 3.6 A
  5. 5. C = 42.35 µF
  6. 6. ΔVo = 136.2 mV

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