Noise characteristics of different switching regulator topologies - Delixi

Create Date: 2024-8-30 12:03:23|Source: Delixi

Currently, there are many different switching regulator topologies. Some topologies are widely used, such as the classic buck converter, also known as the buck converter. However, there are also some lesser-known switch-mode DC-DC converters that include Zeta topologies. These topologies are divided into root topologies and extended topologies. Fundamentally, this topology uses only two switches, one inductor, and two capacitors. All attributed to non-barrier switching regulators; i.e. switching regulators that are not electrically blocked. This topology includes buck converters, boost converters, and inverting buck-boost topologies. All other topologies require rated components. For example, a SEPIC converter also requires a coupling capacitor and a second inductor. In addition to non-blocking switches Delixi voltage regulators, some voltage regulators are electrically blocked through transformers.

                               Noise characteristics of different switching regulator topologies - Delixi

Circuit planners often think of power supplies as black boxes or 4-pole components. It has two input lines and two output lines.

Different switching regulator topologies have different noise characteristics at the end of a 2-port network. A ADP2441 universal buck converter for industrial applications that converts a 24 V input voltage to a 3.3 V output voltage. With this topology, it can be seen that the input generates a pulsed current, which is why the noise is high. When the high-end switch on the ADP2441 is turned on, current flows into the A terminal, and when the switch is turned off, no current flows through node A, but the noise at the output terminal C is very small. In the meantime, the inductance in the output path ensures that there is no pulsed current at the output.

The fundamental noise characteristics of switching regulators provide an important reference for system planners in conceptual planning. The noise level of the most common switching regulator topology input terminals (i.e., terminals A and B for a 2-port network).

For example, rating filtering with a separate LC filter can significantly reduce conducted noise in switching regulator circuits. In this way, the high noise in Table 1 can be prevented. However, the system planner should know which DC-DC converter has high noise at which pin. In this way, they are able to think ahead about the respective filters and the rated space that these filters must occupy.

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