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AN2451 датащи(PDF) 31 Page - STMicroelectronics

номер детали AN2451
подробное описание детали  ST7540 FSK powerline transceiver
PDF  55 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2451 датащи(HTML) 31 Page - STMicroelectronics

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AN2451
Board description
Doc ID 12791 Rev 3
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Figure 26.
Output current vs. supply current typical curve for ST7540 in Tx mode
The transmission output level VOUT rms of 2 V and the current limit IOUT rms(LIMIT) of 500 mA,
fixed for the ST7540 reference design, correspond to a maximum output power POUT of 1 W
over a 4
Ω load. In these conditions, the required dissipation results equal:
Equation 9
Figure 27 shows the curve of PD vs. the load impedance modulus according to the VOUT rms
and IOUT rms(LIMIT) set for the ST7540 reference design.
Figure 27.
Dissipated power vs. load impedance modulus typical curve for ST7540
reference design board
Referring to the relationship between dissipated power and temperature, it can be proven
that in a continuous transmission, i.e. with
θ
JA at its steady-state value of 35 °C/W, a 2 W
dissipation can be sustained in safe conditions if the ambient temperature remains below 55
°C. Instead, supposing a transmission time tTX of 1 s and a duty cycle d of 50%, according
to the graph of Figure 25 the
θ
JA would be 15 °C/W only. In this case a power dissipation of
2.7 W (corresponding to a 1
Ω load) is allowed over the entire ambient temperature range of
the ST7540.
P
D LIMIT
()
P
IN LIMIT
()
P
OUT LIMIT
()
11.7V
0.25A
•
()
2V
0.5A
•
() 2W
≅
–
≅
–
=



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