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AN3213 Datasheet(PDF) 44 Page - STMicroelectronics

Part # AN3213
Description  ST7570 S-FSK power line networking system-on-chip
PDF  64 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3213 Datasheet(HTML) 44 Page - STMicroelectronics

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ST7570 demonstration board description
AN3213
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Doc ID 17429 Rev 1
Figure 39.
Measured ST7570 thermal impedance curve (typical)
The thermal impedance, as a response to dissipation at different duty cycle and duration
values, can be estimated by simulating a 6-cell equivalent model obtained by the curve
fitting from Figure 39, as shown in Figure 40.
Figure 40.
Simulation model of the thermal impedance ZthJA of the ST7570 mounted
on the demonstration board
The actual dissipated power PD can be calculated as:
Equation 13
where
and
. Note that power consumption by receiving
circuitry and linear regulators is considered negligible for thermal analysis purposes. The
relationship between current absorption from the power supply (ICC) and PA output current
to the load (IOUT) is shown in Figure 2.



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