Datenblatt-Suchmaschine für elektronische Bauteile |
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LM2936-33 Datenblatt(PDF) 7 Page - National Semiconductor (TI) |
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LM2936-33 Datenblatt(HTML) 7 Page - National Semiconductor (TI) |
7 / 10 page Applications Information (Continued) Under conditions of higher ambient temperatures, the volt- age and current calculated in the previous examples will drop. For instance, at the maximum ambient of 125˚C the LM2936Z-3.3 can only dissipate 128 mW, limiting the input voltage to 5.6V for a 50 mA load, or 3.0 mA output current for a 40V input. The junction to ambient thermal resistance θ JA rating has two distinct components: the junction to case thermal resis- tance rating θ JC; and the case to ambient thermal resistance rating θ CA. The relationship is defined as: θ JA = θ JC + θ CA. For the SO-8 and TO-252 surface mount packages the θ JA rating can be improved by using the copper mounting pads on the printed circuit board as a thermal conductive path to extract heat from the package. On the SO-8 package the four ground pins are thermally connected to the backside of the die. Adding approximately 0.04 square inches of 2 oz. copper pad area to these four pins will improve the θ JA rating to approximately 110˚C/W. If this extra pad are is placed directly beneath the package there should not be any impact on board density. On the TO-252 package the ground tab is thermally con- nected to the backside of the die. Adding 1 square inch of 2 oz. copper pad area directly under the ground tab will im- prove the θ JA rating to approximately 50˚C/W. While the LM2936 has an internally set thermal shutdown point of typically 150˚C, this is intended as a safety feature only. Continuous operation near the thermal shutdown tem- perature should be avoided as it may have a negative affect on the life of the device. While the LM2936-3.3 will survive input transients to +60V, output regulation is not guaranteed for input voltages greater than 40V. The LM2936 will not withstand a output short circuit with the input above 40V because of safe operating area limitations in the internal PNP pass device. With input voltages above 60V the LM2936 will break down with cata- strophic effects on the regulator and possibly the load as well. Do not use this device in a design where the input operating voltage may exceed 40V, or where transients are likely to exceed 60V. Shutdown Pin The LM2936BM has a pin for shutting down the regulator output. Applying a Logic Level High (>2.0V) to the Shutdown pin will cause the output to turn off. Leaving the Shutdown pin open, connecting it to Ground, or applying a Logic Level Low (<0.6V) will allow the regulator output to turn on. www.national.com 7 |
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Ähnliche Beschreibung - LM2936-33 |
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