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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Name: ____________________   Date: ____________

1.Easy
+−48 VLD = ?CR+−160 V

An ideal boost converter must produce 160 V from 48 V in continuous conduction. Find the duty cycle D.

Vin​ = 48 VVo​ = 160 V
D =
2.Easy
+−5 VLSCR+−12.5 V

An ideal boost converter turns 5 V into 12.5 V and delivers 4 A to its load. Find the average input current Iin.

Vin​ = 5 VVo​ = 12.5 VIo = 4 A
Iin = A
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal boost converter turns 12 V into 20 V at 50 kHz with L = 150 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = 20 Vf = 50 kHzL = 150 µH
ΔIL = A
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal buck converter turns 9 V into 3.6 V at 20 kHz with L = 33 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = 3.6 Vf = 20 kHzL = 33 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 500 kHz. Find the smallest inductance Lcrit for continuous conduction.

Vin​ = 24 VVo​ = −16 Vf = 500 kHzR = 12 Ω
Lcrit = µH
6.Hard
+−15 VLSC = 10 µFR = 50 Ω+−20 V

An ideal boost converter turns 15 V into 20 V for a 50 Ω load at 200 kHz. The output capacitor is 10 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 20 Vf = 200 kHzC = 10 µFR = 50 Ω
ΔVo = mV

Answer key

  1. 1. D = 0.7
  2. 2. Iin = 10 A
  3. 3. ΔIL = 0.64 A
  4. 4. ΔIL = 3.273 A
  5. 5. Lcrit = 4.32 µH
  6. 6. ΔVo = 50 mV

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