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 2 A to its load. Find the average input current Iin.

Vin​ = 12 VVo​ = 16 VIo = 2 A
Iin = A
2.Easy
+−15 VD = 0.6LCR−+Vo​ = ?

An ideal inverting buck-boost converter runs from 15 V with a duty cycle D = 0.6 in continuous conduction. Find the magnitude of the output voltage |Vo|.

Vin​ = 15 VD = 0.6
|Vo| = V
3.Medium
+−12 VSL = ?CR+−9 V

An ideal buck converter turns 12 V into 9 V at a switching frequency of 500 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.2 A.

Vin​ = 12 VVo​ = 9 Vf = 500 kHzΔIL = 0.2 A
L = µH
4.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 12 V into −28 V at 100 kHz with L = 330 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 12 VVo​ = −28 Vf = 100 kHzL = 330 µH
ΔIL = A
5.Hard
tvo​Vo​ΔV = ?DTT2T

A buck converter turns 15 V into 4.5 V for a 20 Ω load at 100 kHz, with L = 220 µH and C = 22 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 15 VVo​ = 4.5 Vf = 100 kHzL = 220 µHC = 22 µF
ΔVo = mV
6.Hard
+−24 VSLC = 220 µFR = 10 Ω−+−16 V

An ideal buck-boost converter turns 24 V into −16 V for a 10 Ω load at 250 kHz. The output capacitor is 220 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 24 VVo​ = −16 Vf = 250 kHzC = 220 µFR = 10 Ω
ΔVo = mV

Answer key

  1. 1. Iin = 2.667 A
  2. 2. |Vo| = 22.5 V
  3. 3. L = 22.5 µH
  4. 4. ΔIL = 0.2545 A
  5. 5. ΔVo = 8.135 mV
  6. 6. ΔVo = 11.64 mV

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