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
+−36 VLSCR+−90 V

An ideal boost converter turns 36 V into 90 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 36 VVo​ = 90 VIo = 5 A
Iin = A
2.Easy
+−36 VD = ?LCR+−16.2 V

An ideal buck converter must produce 16.2 V from 36 V in continuous conduction. Find the duty cycle D.

Vin​ = 36 VVo​ = 16.2 V
D =
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 5.4 V at 200 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 5.4 Vf = 200 kHzL = 100 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 9 V into 18 V at 25 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 18 Vf = 25 kHzL = 100 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 36 V into 9 V for a 12 Ω load at 40 kHz, with L = 220 µH and C = 100 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 36 VVo​ = 9 Vf = 40 kHzL = 220 µHC = 100 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal boost converter turns 48 V into 192 V for a 25 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = 192 Vf = 20 kHzR = 25 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 12.5 A
  2. 2. D = 0.45
  3. 3. ΔIL = 0.108 A
  4. 4. ΔIL = 1.8 A
  5. 5. ΔVo = 23.97 mV
  6. 6. Lcrit = 29.3 µH

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