FDA903U datasheet(46/80 Pages) STMICROELECTRONICS

номер детали	FDA903U

подробное описание детали	1 x 45 W class D digital input automotive power amplifier with ILoad current monitoring, wide voltage operation range for car audio and telematic

PDF	80 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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46 / 80 page

Diagnostic

FDA903U

46/80

DS12498 Rev 2

10.9

Thermal protection

The device integrates different protection levels against over-temperature conditions.

The first protection level consists only in communicating if the temperature exceeds four

different thresholds, from TW4 to TW1. The result is provided in two ways:



Setting DB1[7-4];



Pulling down the CDDiag pin, coherently with the setting of IB4[6-4].

If needed, the user is in charge of taking proper actions to counteract the temperature rising.

The second protection level consists in the output signal attenuation as a function of the

temperature, in order to reduce the power dissipation. The thermal attenuation occurs in the

temperature range between Tpl and Tph, as shown in Figure 62.

The third level protection consists in switching off the power stage when the temperature

overpasses the Tsh value. As shown in Figure 62, after thermal shutdown triggering, the

device FSM enters in "Short to Vcc / Gnd diagnostic state", preventing subsequent power

stage turn on in case of shorts to battery or ground.

The temperature values TW4, TW3, TW2, TW1, Tpl, Tph, Tsh are always in tracking,

independently of the parameters spread. If the user sets the I2C bit IB12[7], all the

mentioned thresholds are reduced of 15°C.

Figure 62. Thermal attenuation curve

FDA903U датащи(PDF) 46 Page - STMicroelectronics