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 VLD = 0.4CR+−Vo​ = ?

An ideal boost converter runs from 36 V with a duty cycle D = 0.4 in continuous conduction. Find the output voltage Vo.

Vin​ = 36 VD = 0.4
Vo = V
2.Easy
+−9 VLSCR+−12 V

An ideal boost converter turns 9 V into 12 V and delivers 2 A to its load. Find the average input current Iin.

Vin​ = 9 VVo​ = 12 VIo = 2 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 48 V into −32 V at 200 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 48 VVo​ = −32 Vf = 200 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 36 V into 18 V at 200 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 36 VVo​ = 18 Vf = 200 kHzL = 100 µH
ΔIL = A
5.Hard
tiL​Imax​IL​DTT2T

An ideal inverting buck-boost converter turns 24 V into −16 V for a 12 Ω load at 20 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = −16 Vf = 20 kHzR = 12 Ω
Lcrit = µH
6.Hard
+−15 VLSC = 22 µFR = 5 Ω+−37.5 V

An ideal boost converter turns 15 V into 37.5 V for a 5 Ω load at 250 kHz. The output capacitor is 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 37.5 Vf = 250 kHzC = 22 µFR = 5 Ω
ΔVo = mV

Answer key

  1. 1. Vo = 60 V
  2. 2. Iin = 2.667 A
  3. 3. ΔIL = 0.64 A
  4. 4. ΔIL = 0.45 A
  5. 5. Lcrit = 108 µH
  6. 6. ΔVo = 818.2 mV

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