FDA803D datasheet(47/78 Pages) STMICROELECTRONICS

tên linh kiện	FDA803D

Giải thích chi tiết về linh kiện	1 x 45 W class D digital input automotive power amplifier with diagnostics, wide voltage operation range for car audio and telematic

PDF	78 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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47 / 78 page

DocID031487 Rev 2

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FDA803D

Diagnostic

11.9

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 59.

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

overpasses the Tsh value. As shown in Figure 2, 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 59. Thermal attenuation curve

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