RS-485 Drivers Calculating the Power Dissipation

2020-11-26
This tech brief explains how to calculate the power dissipation of a RS-485 driver under a load condition. Figure 1shows the simplified system block diagram together with the associated system parameters.
The total power dissipation is determined by calculating the individual power components for DC and AC under a no-load condition, followed by the calculations of the driver internal power consumption when only driving the termination resistor, and when only driving the load capacitance. The sum of these power components yield the total power dissipation of the driver.

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Mar.25.20

Rev.1.00

R15ZZ0002EU0100

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