TS617 datasheet(12/19 Pages) STMICROELECTRONICS

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Safe operating area

TS617

12/19

Safe operating area

Figure 24.

Equivalent schematic

Vout(rms) is the rms output voltage value. Iout(rms) is the rms output current value through

the output load R-load. When supplied by +/-Vcc, the power which must be dissipated by

one operator is p=Iout(rms)x(+Vcc-Vout(rms)). Since the TS617 is used in a differential

configuration using both operators, it must dissipate 2 x p. The power dissipated by the

TS617 is derived from:

(eq1),

P = 2 x [ Iout(rms) x (+Vcc-Vout(rms)) ].

In the following formula:

(eq2),

Tj is the junction temperature, Tamb is the ambient temperature and Rthja is the junction-to-

ambient thermal resistance of the package (SO-14: Rthja = 103° C/watt).

Assuming that Tj must be lower than 150° C to avoid any damage to the dice, it is derived

from (eq2):

(eq3),

From (eq1) and (eq3) we can easily extract the maximum value of Vout(rms) that the TS617

can drive without any damage (according to Tamb and R-load).

Tamb

–

()

Rthja

--------------------------------

Pmax

150

Tamb

–

103

--------------------------------

inWatt

()

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