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+−60 V

An ideal boost converter turns 36 V into 60 V and delivers 1.5 A to its load. Find the average input current Iin.

Vin​ = 36 VVo​ = 60 VIo = 1.5 A
Iin = A
2.Easy
+−48 VD = 0.45LCR+−Vo​ = ?

An ideal buck converter runs from 48 V with a duty cycle D = 0.45 in continuous conduction. Find the output voltage Vo.

Vin​ = 48 VD = 0.45
Vo = V
3.Medium
tiL​Imax​Imin​ΔI = ?DTT2T

An ideal inverting buck-boost converter turns 9 V into −6 V at 50 kHz with L = 100 µH. Find the peak-to-peak inductor ripple current ΔIL.

Vin​ = 9 VVo​ = −6 Vf = 50 kHzL = 100 µH
ΔIL = A
4.Medium
+−9 VSL = ?CR+−4.5 V

An ideal buck converter turns 9 V into 4.5 V at a switching frequency of 200 kHz. Find the inductance L that keeps the peak-to-peak inductor ripple current at 0.8 A.

Vin​ = 9 VVo​ = 4.5 Vf = 200 kHzΔIL = 0.8 A
L = µH
5.Hard
+−9 VSLC = 470 µFR = 5 Ω−+−6 V

An ideal buck-boost converter turns 9 V into −6 V for a 5 Ω load at 500 kHz. The output capacitor is 470 µF. Find the peak-to-peak output voltage ripple ΔVo in mV.

Vin​ = 9 VVo​ = −6 Vf = 500 kHzC = 470 µFR = 5 Ω
ΔVo = mV
6.Hard
+−36 VSL = 33 µHC = ?R+−27 V

A buck converter turns 36 V into 27 V at 250 kHz with L = 33 µH. Find the output capacitance C that limits the peak-to-peak output ripple to 50 mV.

Vin​ = 36 VVo​ = 27 Vf = 250 kHzL = 33 µHΔVo = 50 mV
C = µF

Answer key

  1. 1. Iin = 2.5 A
  2. 2. Vo = 21.6 V
  3. 3. ΔIL = 0.72 A
  4. 4. L = 14.06 µH
  5. 5. ΔVo = 2.043 mV
  6. 6. C = 8.182 µF

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