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
+−5 VLSCR+−10 V

An ideal boost converter turns 5 V into 10 V and delivers 1 A to its load. Find the average input current Iin.

Vin​ = 5 VVo​ = 10 VIo = 1 A
Iin = A
2.Easy
+−12 VLD = 0.6CR+−Vo​ = ?

An ideal boost converter runs from 12 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 12 VD = 0.6
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 15 V into −35 V at 100 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = −35 Vf = 100 kHzL = 100 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 48 V into −16 V at 25 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = −16 Vf = 25 kHzL = 330 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 36 V into −84 V for a 12 Ω load at 200 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = −84 Vf = 200 kHzR = 12 Ω
Lcrit = µH
6.Hard
+−48 VLSC = 220 µFR = 20 Ω+−96 V

An ideal boost converter turns 48 V into 96 V for a 20 Ω load at 50 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 48 VVo​ = 96 Vf = 50 kHzC = 220 µFR = 20 Ω
ΔVo = mV

Answer key

  1. 1. Iin = 2 A
  2. 2. Vo = 30 V
  3. 3. ΔIL = 1.05 A
  4. 4. ΔIL = 1.455 A
  5. 5. Lcrit = 2.7 µH
  6. 6. ΔVo = 218.2 mV

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