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LM143H bảng dữ liệu(PDF) 5 Page - National Semiconductor (TI) |
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LM143H bảng dữ liệu(HTML) 5 Page - National Semiconductor (TI) |
5 / 12 page Typical Performance Characteristics (Continued) Input Voltage Range Output Voltage Swing Voltage Gain Supply Current Input Current Voltage Gain TLH7783 – 3 Application Hints (See AN-127) The LM143 is designed for trouble free operation at any supply voltage up to and including the guaranteed maximum of g40V Input overvoltage protection both common-mode and differential is 100% tested and guaranteed at the maxi- mum supply voltage Furthermore all possible high voltage destructive modes during supply voltage turn-on have been eliminated by design As with most IC op amps however certain precautions should be observed to insure that the LM143 remains virtually blow-out proof Although output short circuits to ground or either supply can be sustained indefinitely at lower supply voltages these short circuits should be of limited duration when operating at higher supply voltages Units can be destroyed by any com- bination of high ambient temperature high supply voltages and high power dissipation which results in excessive die temperature This is also true when driving low impedance or reactive loads or loads that can revert to low impedance for example the LM143 can drive most general purpose op amps outside of the maximum input voltage range causing heavy current to flow and possibly destroying both devices Precautions should be taken to insure that the power sup- plies never become reversed in polarityeven under tran- sient conditions With reverse voltage the IC will conduct excessive current fusing the internal aluminum intercon- nects Voltage reversal between the power supplies will al- most always result in a destroyed unit In high voltage applications which are sensitive to very low input currents special precautions should be exercised For example with high source resistances care should be tak- en to prevent the magnitude of the PC board leakage cur- rents although quite small from approaching those of the op amp input currents These leakage currents become larger at 125 C and are made worse by high supply volt- ages To prevent this PC boards should be properly cleaned and coated to prevent contamination and to pro- vide protection from condensed water vapor when operat- ing below 0 C A guard ring is also recommended to signifi- cantly reduce leakage currents from the op amp input pins to the adjacent high voltage pins in the standard op amp pin connection as shown in Figure 1 Figures 2 3 and 4 show how the guard ring is connected for the three most common op amp configurations Finally caution should be exercised in high voltage applica- tions as electrical shock hazards are present Since the negative supply is connected to the case users may inad- vertantly contact voltages equal to those across the power supplies The LM143 can be used as a plug-in replacement in most general purpose op amp applications The circuits present- ed in the following section emphasize those applications which take advantage of the unique high voltage abilities of the LM143 5 |
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