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+−16 V

An ideal boost converter turns 12 V into 16 V and delivers 5 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 16 VIo = 5 A
Iin = A
2.Easy
+−5 VLD = 0.6CR+−Vo​ = ?

An ideal boost converter runs from 5 V with a duty cycle D = 0.6 in continuous conduction. Find the output voltage Vo.

Vin​ = 5 VD = 0.6
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 48 V into −144 V at 500 kHz with L = 22 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = −144 Vf = 500 kHzL = 22 µH
ΔIL = A
4.Medium
+−9 VSL = ?CR+−5.4 V

An ideal buck converter turns 9 V into 5.4 V at a switching frequency of 40 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 1.5 A.

Vin​ = 9 VVo​ = 5.4 Vf = 40 kHzΔIL = 1.5 A
L = µH
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 12 V into 3.6 V for a 4 Ω load at 25 kHz, with L = 220 µH and C = 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 12 VVo​ = 3.6 Vf = 25 kHzL = 220 µHC = 470 µF
ΔVo = mV
6.Hard
tiL​Imax​IL​DTT2T

An ideal buck converter turns 48 V into 14.4 V for a 25 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 48 VVo​ = 14.4 Vf = 20 kHzR = 25 Ω
Lcrit = µH

Answer key

  1. 1. Iin = 6.667 A
  2. 2. Vo = 12.5 V
  3. 3. ΔIL = 3.273 A
  4. 4. L = 36 µH
  5. 5. ΔVo = 4.874 mV
  6. 6. Lcrit = 437.5 µH

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