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STPA008-4WX Datasheet(PDF) 19 Page - STMicroelectronics |
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STPA008-4WX Datasheet(HTML) 19 Page - STMicroelectronics |
19 / 29 page DocID027887 Rev 2 19/29 STPA008 General information 28 4.3 Protections 4.3.1 Short circuits and open load operation When the IC detects a short circuit to ground, to Vbatt or across the load, the output of the amplifier is put in three-state (high impedance condition). In case of short circuit to ground or Vcc, the amplifier exits from the three-state condition only when the short-circuit is released and the output returns inside the limits imposed by an internal voltage comparator. When a short across the load is present, the power stage sees an over-current and is brought in protection mode for about 100 μs. After this time, if the short circuit condition is removed the amplifier returns to play, otherwise the high impedance state is maintained and the check is repeated every 100 μs. Disconnection of load (open load condition) doesn't affect the amplifier, which continues to play. 4.3.2 Over-voltage and load dump protection When the battery voltage is higher than 19 V, the amplifier put in tri-state. It stops playing till the supply voltage returns in the permitted range. The amplifier is protected against load dump surges having amplitude as high as 50 V and a rising time as low as 2 ms (see Figure 24). Figure 24. Load dump protection diagram 4.3.3 Thermal protection If the junction temperature of the IC overcomes Tj = 150 °C, a smooth mute is applied to reduce output power and limit power dissipation. If this is not enough and the junction temperature continues to increase, the amplifier is switched off when it reaches the maximum temperature of 170 °C. Figure 25. Thermal protection diagram |
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