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7534 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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7534 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 16 page 3 Rev. A, July 2004 ©2004 Fairchild Semiconductor Corporation Figure 1. Self-heating MOSFET macro-model independent of global temperature definition Parametric data for several temperature points are used for model calibration result- ing in a macro-model which provides representative simulation data for any rated operating junction temperature. Temperature dependent model parameters respond in closed loop form to the junc- tion temperature information provided by node Tj. Performance is independent of SPICE’s global temperature definition listed as .TEMP and temperature option TNOM, circumventing the level-NMOS model primitive temperature limitation. All MOSFET operating losses are inclusive in the current source G_Pdiss representing instantaneous power dissipation to the thermal model. Multiple MOSFETs may be simulated at different and variable junction temperatures. Each MOSFET may be connected to a heat sink model via note Tcase. The heat sink model may be device specific, so heat sink optimization becomes possible. Current source G_Pdiss is referenced to the simulation ground reference, permitting use of the model in bridge topologies. An example of a symbol representation of the self-heating MOSFET model is shown in Figure 2. Symbol files for OrCAD’s two circuit entry tools "PSPICE Schematic" and "OrCAD Capture" may be downloaded from wwww.fairchildsemi.com. Recom- mended symbol implementation is to designate the pinout attribute for Tj as optional (ERC = DON’T CARE, Float=UniqueNet). Tj is the representation of the device jun- tion temperature. It may be used as a monitoring point, or it may be connected to a defined voltage source to override the self-heating feature. Tcase must be connected to a heat sink model. Treatment of connections to the model’s gate, drain, and sour- rce terminals are no different than those of the standard MOSFET model. + - DRAIN 2 LDRAIN RLDRAIN DBREAK DBODY DPLCAP 5 10 5 51 + - + - + - 6 8 6 8 5 8 51 RSLC2 ESG ESLC G_RDRAIN EBREAK MWEAK MMED MSTRO CIN G_RSOURCE LSOURCE RLSOURCE SOURCE 3 EVTEMP RGATE LGATE RLGATE GATE 1 CA CB S1A S2A S1B S2B EGS EDS 11 50 16 21 6 20 9 87 14 15 13 8 14 13 13 12 EVTHRES G_RSLC1 CTHERM1 RTHERM1 CTHERM6 RTHERM6 CTHERM5 RTHERM5 CTHERM2 RTHERM2 CTHERM3 RTHERM3 CTHERM4 RTHERM4 G_PDISS 0 Tj Tcase 106 105 104 103 102 32 31 - + EDBODY 30 G_RDBODY G_RDBREAK RDBODY |
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