Universal buck converter reference design for educational purposes
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Key Document


This universal buck converter reference design features a voltage mode buck converter in combination with a tiny, onboard electronics load to demonstrate the relationship in between small signal analysis in frequency domain (= network analysis) and large signal analysis in time domain (= transient response). The loop bandwidth has been squeezed to maximum with a cross over frequency at 20 kHz+. When using this converter design in mass production, it’s recommended to use compensation values for a cross over frequency of 15 kHz with a safe gain margin. In this design, the loop bandwidth has been exhausted to test Bode function of measurement equipment and demonstrate the impact of drain jitter (= subharmonic noise) regarding power integrity.

  • Extra low input voltage < 16 V for safety reasons
  • 2.5-mm jack to use cost effective 12 V wall adapter
  • Input filter to demonstrate attenuation of reflected ripple (= conducted emissions)
  • RC snubber circuit to demonstrate RF ripple reduction (= radiated emissions)
  • Load and load control could be fully disconnected from input and output for efficiency measurement
  • Numerous test points to access all voltages and waveforms

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)8
Vin (Max) (V)16
Vout (Nom) (V)5
Iout (Max) (A)1
Output Power (W)5
Input TypeDC
TopologyBuck- Non Sync

TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMC555  World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz  Clocks & timing  Sample & Buy View Design Kits & Evaluation Modules
TL750L  150-mA, 26-V, low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS40200  Wide Input Non-Synchronous Buck DC/DC Controller  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
UCC27517A  4-A/4-A single-channel gate driver with 5-V UVLO and negative input voltage handling  Gate drivers  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMC555 Download Download
TL750L Download
TPS40200 Download Download
Download Download
UCC27517A Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1809 08 Mar 2019
Design files (6)
Title Type Size (KB) Date
ZIP 59 10 Mar 2019
ZIP 808 10 Mar 2019
PDF 698 10 Mar 2019
PDF 120 10 Mar 2019
PDF 140 10 Mar 2019
PDF 135 10 Mar 2019

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