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PS7A5301QRGRRQ1 Datasheet(PDF) 11 Page - Texas Instruments |
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PS7A5301QRGRRQ1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page 11 TPS7A53-Q1 www.ti.com SBVS298 – SEPTEMBER 2017 Product Folder Links: TPS7A53-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7.3.3 Internal Protection Features In many applications, fault events can occur that damage devices in the system. Short circuits and excessive heat are the most common fault events for power supplies. The TPS7A53-Q1 implements circuitry to protect the device and its load during these events. Continuously operating in these fault conditions or above a junction temperature of 140°C is not recommended because the long-term reliability of the device is reduced. 7.3.3.1 Foldback Current Limit (ICL) The internal current limit circuit is used to protect the LDO against high load-current faults or shorting events. During a current-limit event, the LDO sources constant current; therefore, the output voltage falls with decreased load impedance. Thermal shutdown can activate during a current limit event because of the high power dissipation typically found in these conditions. For proper operation of the current limit, minimize the inductances to the input and load. Continuous operation in current limit is not recommended. 7.3.3.2 Thermal Protection (Tsd) The thermal shutdown circuit protects the LDO against excessive heat in the system, either resulting from current limit or high ambient temperature. The output of the LDO turns off when the LDO temperature (junction temperature, TJ) exceeds the rising thermal shutdown temperature. The output turns on again after TJ decreases below the falling thermal shutdown temperature. A high power dissipation across the device, combined with a high ambient temperature (TA), can cause TJ to be greater than or equal to Tsd, triggering the thermal shutdown and causing the output to fall to 0 V. The LDO can cycle on and off when thermal shutdown is reached under these conditions. |
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