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 VLSCR+−30 V

An ideal boost converter turns 12 V into 30 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 30 VIo = 5 A
Iin = A
2.Easy
+−48 VD = ?LCR+−24 V

An ideal buck converter must produce 24 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = 24 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −4 V at 25 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −4 Vf = 25 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 48 V into 36 V at 200 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = 36 Vf = 200 kHzL = 330 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 36 V into 14.4 V for a 5 Ω load at 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = 14.4 Vf = 500 kHzR = 5 Ω
Lcrit = µH
6.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 36 V into −36 V for a 25 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = −36 Vf = 20 kHzR = 25 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 12.5 A
  2. 2. D = 0.5
  3. 3. ΔIL = 0.8 A
  4. 4. ΔIL = 0.1364 A
  5. 5. Lcrit = 3 µH
  6. 6. Lcrit = 156.3 µH

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