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
+−9 VLSCR+−22.5 V

An ideal boost converter turns 9 V into 22.5 V and delivers 3 A to its load. Find the average input current Iin.

Vin​ = 9 VVo​ = 22.5 VIo = 3 A
Iin = A
2.Easy
+−15 VD = 0.7LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 15 V with a duty cycle D = 0.7 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 15 VD = 0.7
|Vo| = V
3.Medium
tiL​Imax​ = ?Imin​Io​DTT2T

A buck converter turns 36 V into 14.4 V for a 5 Ω load. It switches at 20 kHz with L = 330 µH. Find the peak inductor current Imax.

Vin​ = 36 VVo​ = 14.4 Vf = 20 kHzL = 330 µHR = 5 Ω
Imax = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 15 V into 7.5 V at 200 kHz with L = 10 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 15 VVo​ = 7.5 Vf = 200 kHzL = 10 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 15 V into 6 V for a 5 Ω load at 20 kHz, with L = 150 µH and C = 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 6 Vf = 20 kHzL = 150 µHC = 100 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 36 V into 72 V for an 8 Ω load at 100 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 36 VVo​ = 72 Vf = 100 kHzR = 8 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 7.5 A
  2. 2. |Vo| = 35 V
  3. 3. Imax = 3.535 A
  4. 4. ΔIL = 1.875 A
  5. 5. ΔVo = 75 mV
  6. 6. Lcrit = 5 µH

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