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GM78L12S8B Datasheet(PDF) 10 Page - Gamma Microelectronics Inc. |
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GM78L12S8B Datasheet(HTML) 10 Page - Gamma Microelectronics Inc. |
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10 / 13 page  10 APPLICATION INFORMATION Design Considerations The GM78L00 series regulators have thermal overload protection from excessive power, internal short-circuit protection limits each circuit's maximum current, and output transistor safe-area protection for reducing the output current as the voltage across each pass transis- tor is increased. Although the internal power dissipation is limited, the junction temperature must be kept below the maximum specified temperature (125°C) in order to meet data sheet specifications. Thermal Considerations The TO-92 molded package is capable of unusual high power dissipation due to the lead frame design. However, its thermal capabilities are generally over- looked because of a lack of understanding of the ther- mal paths from the semiconductor junction to ambient temperature. While thermal resistance is normally specified for the device mounted 1cm above an infinite heat sink, very little has been mentioned of the options available to im- prove the conservatively rated thermal capability. An ex- planation of the thermal paths of the TO-92 will allow the designer to determine the thermal stress which is applying in any given application. The TO-92 Package The TO-92 package thermal paths are complex. In addi- tion to the path through the molding compound to ambi- ent temperature, there is another path through the leads, in parallel with the case path, to ambient tem- perature, as shown in Figure 5. The total thermal resistance in this model is then: Where: q = thermal resistance of the case between the reg- JC ulator die and a point on the case directly above the die location. q = thermal resistance between the case and air at CA ambient temperature. q = thermal resistance from regulator die through JL the input lead to a point 1/16 inch below the regula- tor case. q = total thermal resistance of the input/output LA ground leads to ambient temperature. q = junction to ambient thermal resistance. JA JA = ( JA + CA)( JL + LA ) JA + CA + JL + LA CA JC JL LA TJ P (W) E TA Figure 5. TO-92 Thermal Equivalent Circuit |
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