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LT3071EUFD Datasheet(PDF) 19 Page - Linear Technology |
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LT3071EUFD Datasheet(HTML) 19 Page - Linear Technology |
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19 / 28 page  LT3071 3071f ApplicAtions inFormAtion The X7R type has better stability across temperature, whiletheX5Rislessexpensiveandisavailableinhigher values.CarestillmustbeexercisedwhenusingX5Rand X7R capacitors; the X5R and X7R codes only specify operatingtemperaturerangeandmaximumcapacitance change over temperature. Capacitance change due to DCbiaswithX5RandX7RcapacitorsisbetterthanY5V andZ5Ucapacitors,butcanstillbesignificantenoughto dropcapacitorvaluesbelowappropriatelevels.Capacitor DCbiascharacteristicstendtoimproveascomponent casesizeincreases,butexpectedcapacitanceatoperat- ingvoltageshouldbeverified.Voltageandtemperature coefficientsarenottheonlysourcesofproblems.Some ceramiccapacitorshaveapiezoelectricresponse.Apiezo- electricdevicegeneratesvoltageacrossitsterminalsdue tomechanicalstress,similartothewayapiezoelectric microphoneworks.Foraceramiccapacitorthestress canbeinducedbyvibrationsinthesystemorthermal transients. Stability and Input Capacitance The LT3071 is stable with a minimum capacitance of 47µFconnectedtoitsINpins.UselowESRcapacitorsto minimizeinstantaneousvoltagedropsunderlargeload transientconditions.LargeVINdroopsduringlargeload transientsmaycausetheregulatortoenterdropoutwith corresponding degradation in load transient response. Increasedvaluesofinputandoutputcapacitancemaybe necessarydependingonanapplication’srequirements. Sufficient input capacitance is critical as the circuit is intentionallyoperatedclosetodropouttominimizepower. Ideally,theoutputimpedanceofthesupplythatpowers INshouldbelessthan10mΩtosupporta5Aloadwith largetransients. Incaseswherewireisusedtoconnectapowersupply totheinputoftheLT3071(andalsofromthegroundof theLT3071backtothepowersupplyground),largeinput capacitorsarerequiredtoavoidanunstableapplication. ThisisduetotheinductanceofthewireforminganLC tankcircuitwiththeinputcapacitorandnotaresultofthe LT3071beingunstable.Theselfinductance,orisolated inductance,ofawireisdirectlyproportionaltoitslength. However,thediameterofawiredoesnothaveamajor influenceonitsselfinductance.Forexample,oneinchof 18-AWG,0.04inchdiameterwirehas28nHofselfinduc- tance.Theselfinductanceofa2-AWGisolatedwirewith adiameterof0.26inchisabouthalftheinductanceofa 18-AWGwire.Theoverallselfinductanceofawirecan bereducedintwoways.Oneistodividethecurrentflow- ingtowardstheLT3071betweentwoparallelconductors whichflowsinthesamedirectionineach.Inthiscase, DC BIAS VOLTAGE (V) 0 –100 –80 –60 –40 –20 4 8 12 16 3071 F04 0 20 2 6 10 X5R Y5V 14 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF TEMPERATURE (°C) –50 –20 0 40 25 75 X5R Y5V 3071 F05 –40 –60 –25 0 50 100 125 –80 –100 20 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF Figure 4. Ceramic Capacitor DC Bias Characteristics Figure 5. Ceramic Capacitor Temperature Characteristics |
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