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LM7915CT Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM7915CT Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 10 page Design Considerations The LM79XX fixed voltage regulator series has thermal overload protection from excessive power dissipation inter- nal short circuit protection which limits the circuit’s maxi- mum current and output transistor safe-area compensation for reducing the output current as the voltage across the pass transistor is increased Although the internal power dissipation is limited the junc- tion temperature must be kept below the maximum speci- fied temperature (125 C) in order to meet data sheet specifi- cations To calculate the maximum junction temperature or heat sink required the following thermal resistance values should be used Typ Max Typ Max Package iJC iJC iJA iJA CW CW CW CW TO-220 30 50 60 40 PD MAX e TJ Max b TA iJC a iCA or TJ Max TA iJA iCA e iCS a iSA (without heat sink) Solving for TJ TJ e TA a PD (iJC a iCA)or e TA a PDiJA (without heat sink) Where TJ e Junction Temperature TA e Ambient Temperature PD e Power Dissipation iJA e Junction-to-Ambient Thermal Resistance iJC e Junction-to-Case Thermal Resistance iCA e Case-to-Ambient Thermal Resistance iCS e Case-to-Heat Sink Thermal Resistance iSA e Heat Sink-to-Ambient Thermal Resistance Typical Applications (Continued) Bypass capacitors are necessary for stable operation of the LM79XX series of regulators over the input voltage and out- put current ranges Output bypass capacitors will improve the transient response by the regulator The bypass capacitors (22 mF on the input 10 mFonthe output) should be ceramic or solid tantalum which have good high frequency characteristics If aluminum electrolyt- ics are used their values should be 10 mF or larger The bypass capacitors should be mounted with the shortest leads and if possible directly across the regulator termi- nals High Stability 1 Amp Regulator TLH7340 – 5 Load and line regulation k 001% temperature stability s 02% Determine Zener current Solid tantalum Select resistors to set output voltage 2 ppm C tracking suggested 4 |
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