SLVAEV3A June   2020  – November 2022 TPS546D24A , TPS54824

 

  1.   Collection of DC/DC Buck Regulator Technical Documentation
  2.   Trademarks
  3. 1 Low Noise
  4. 2 Power Density
  5. 3 Thermals
  6. 4 Control-Mode Architectures
  7. 5 Powering Performance FPGAs, ASICs, and SoC
  8. 6 Light-Load and Full-Load Efficiency
  9. 7 Layout
  10. 8 Power Supply Topology
  11. 9 Packaging
  12. 10Revision History

1 Low Noise

The term low noise means a lot of different things to a lot of different designer. Below are the most common types of noise experienced in noise-sensitive applications.

  • Low Output Voltage Ripple (µVPP): the residual periodic variation of the DC voltage within a power supply, usually periodic, and originates as the output of a rectifier or from generation and commutation of DC power.
  • Phase Noise (µVRMS): represented in the frequency domain of a waveform and consists of rapid, short-term, random fluctuations in the phase (frequency). This is caused by time-domain instabilities (jitter).
  • 1/f noise: low frequency noise for which the noise power is inversely proportional to the frequency.
  • Power Supply Rejection: measure of how well a circuit rejects ripple coming from the input power supply at various frequencies. Basically is is log 20 of the open-loop gain of the regulator feedback divided by the gain from VIN to VOUT with the regulator feedback loop open.
  • Electromagnetic Interference (EMI): an electronic emission that interferes with components, RF systems, and most electronic devices.
Table 1-1 Low Noise Documentation
Document TitleLiterature Number
Reduce Buck-Converter EMI and Voltage Stress by Minimizing Inductive ParasiticsSLYT682
Output Ripple Voltage of Buck Switching RegulatorsSLVA630A
Reducing Noise on the Output of a Switching RegulatorSLYT740
Not All Jitter is Created EqualSLUA747A
Controlling the Switch-node Ringing of Synchronous Buck ConvertersSLYT465
Simplify Low-EMI Design with Power ModulesSLYY123
Seminar 900 Topic 2 – Snubber Circuits: Theory, Design and ApplicationSLUP100
Minimizing Output Ripple During StartupSLVA866
Measuring Various Types of Low-frequency Noise from DC/DC Switching ConvertersSLYY134
Output Noise Filtering for DC/DC Power ModulesSNVA871
Reducing Output Ripple and Noise with the TPS84259 ModuleSLVA549
Using a 4MHz switching regulator w/o a Linear Regulator to Power a Data ConverterSLYT756
Extend Battery Life with < 100 nA IQ Buck Converter Achieving < 150 µV Voltage Ripple (with PI filter design)SLVAEG1
Analysis and Design of Input Filters for DC-DC CircuitsSNVA801
Calculating Output Capacitance to Meet Transient and Ripple Requirements of an Integrated POL Converter Design Based on D-CAPx™ ModulatorsSLVA874
Controlling Output Ripple and Achieving ESR Independence with Constant On-Time RegulatorsSNVA166A
Power Tips: Designing a two-stage LC filterBlog
Design a Second-stage Filter for a Power Module in Noise-sensitive ApplicationsBlog
How You Measure Ripple Can Make or Break YouBlog
Measuring Noise Requirements for an A-to-D Converter's Power SuppliesBlog
How to Filter Out Noise in Your DC/DC DesignBlog
LDO or Switcher - That is the QuestionTI Training
Understanding, Measuring and Reducing Output Noise of a DC/DC Switching RegulatorTI Training
Measuring Vout Ripple of DC/DC ConvertersTI Training