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LM2941C Datenblatt(PDF) 11 Page - Texas Instruments |
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LM2941C Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 30 page LM2941, LM2941C www.ti.com SNVS770I – JUNE 1999 – REVISED JANUARY 2015 Feature Description (continued) 7.3.3 Thermal Shutdown (TSD) The LM2941 contains the thermal shutdown circuitry to turn off the output when excessive heat is dissipated in the LDO. The internal protection circuitry of the LM2941 is designed to protect against thermal overload conditions. The TSD circuitry is not intended to replace proper heat sinking. Continuously running the device into thermal shutdown degrades its reliability as the junction temperature will be exceeding the absolute maximum junction temperature rating. 7.3.4 Thermal Overload Protection The LM2941 incorporates a linear form of thermal protection that limits the junction temperature (TJ) to typically 155°C. Should the LM2941 see a fault condition that results in excessive power dissipation and the junction temperature approaches 155°C, the device will respond by reducing the output current (which reduces the power dissipation) to hold the junction temperature at 155°C. Thermal Overload protection is not an ensured operating condition. Operating at, or near to, the thermal overload condition for any extended period of time is not encouraged, or recommended, as this may shorten the lifetime of the device. 7.4 Device Functional Modes 7.4.1 Operation With ON/OFF Control The ON/OFF pin has no internal pull-up or pull-down to establish a default condition and, as a result, this pin must be terminated externally, either actively or passively. The ON/OFF pin requires a low level to enable the output, and a high level to disable the output. To ensure reliable operation, the ON/OFF pin voltage must rise above the maximum ON/OFF(OFF) voltage threshold (2 V) to disable the output, and must fall below the minimum ON/OFF(ON) voltage threshold (0.8 V) to enable the output. If the ON/OFF function is not needed this pin can be connected directly to Ground. If the ON/OFF pin is being pulled to a high state through a series resistor, an allowance must be made for the ON/OFF pin current that will cause a voltage drop across the pull-up resistor Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM2941 LM2941C |
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