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
+−24 VD = ?LCR−+36 V

An ideal inverting buck-boost converter must produce −36 V from 24 V in continuous conduction. Find the duty cycle D.

Vin​ = 24 VVo​ = −36 V
D =
2.Easy
+−48 VSLCR−+16 V

An ideal buck-boost converter turns 48 V into 16 V and delivers 3 A to its load. Find the average input current Iin.

Vin​ = 48 VVo​ = 16 VIo = 3 A
Iin = A
3.Medium
+−48 VSL = ?CR+−19.2 V

An ideal buck converter turns 48 V into 19.2 V at a switching frequency of 200 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 1 A.

Vin​ = 48 VVo​ = 19.2 Vf = 200 kHzΔIL = 1 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 5.4 V at 500 kHz with L = 47 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 5.4 Vf = 500 kHzL = 47 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 24 V into 96 V for a 2 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = 96 Vf = 200 kHzR = 2 Ω
Lcrit = µH
6.Hard
+−9 VSLC = 10 µFR = 12 Ω−+−21 V

An ideal buck-boost converter turns 9 V into −21 V for a 12 Ω load at 20 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = −21 Vf = 20 kHzC = 10 µFR = 12 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.6
  2. 2. Iin = 1 A
  3. 3. L = 57.6 µH
  4. 4. ΔIL = 0.09191 A
  5. 5. Lcrit = 0.2344 µH
  6. 6. ΔVo = 6125 mV

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