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TPS2342 Datasheet(PDF) 25 Page - Texas Instruments |
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TPS2342 Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 53 page  TPS2342 SLUS572E − OCTOBER, 2003 − REVISED FEBRUARY 2005 25 www.ti.com APPLICATION INFORMATION Thermal Shutdown Under normal operating consitions, the power dissipation in the TS2342 is low enough that the junction temperature (TJ) is not more than 15°C above air temperature (TA). However, in the case of a load that exceeds PCI specifications (but remains under the TPS2342 overcurrent threshold) power dissipation can be higher. To prevent any damage from an out-of-specification load or severe rise in ambient temperature, the TPS2342 contains two independent thermal shutdown circuits, one for each main supply slot. VAUX is not affected by the thermal shutdown. The highest power dissipation in the TPS2342 is from the 12-V power FET so that TPS2342 temperature sense elements are integrated closely with these FETs. These sensors indicate when the temperature at these transistors exceeds approximately 150 °C, due either to average device power dissipation, 12-V power FET power dissipation, or a combination of both. When excessive junction temperature is detected in one slot, that slot’s fault latch is set and remains set until the junction temperature drops by approximately 10 °C and the slot is then restarted. The other slot is not affected by this event. Determining Component Values Load Conditions Table 2. Load Conditions for Determining Component Values SUPPLY DRIVER ILOAD (A) ITRIP (A) CLOAD ( µF) SR (V/s) +12 V 0.5 0.94 300 250 +5 V 5 7.0 3000 200 +3.3 V 7.6 10.0 3000 200 −12 V 0.1 0.19 150 200 +3.3 Vaux 0.375 1.0 150 5000 +3.3 Vaux(1) 0.02 0.04 150 100 +1.5 VIO 1.5 4.0 150 200 (1) +3.3 Vaux turn-on from stand-by power. |
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