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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LMP8481MM-S/NOPB датащи(PDF) 11 Page - Texas Instruments |
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LMP8481MM-S/NOPB датащи(HTML) 11 Page - Texas Instruments |
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11 / 24 page  +IN -IN VCC 4.5V < VCC < 76V 4.0V < VIN < 76V RSENSE GND VOUT LMP8481 IL + - L o a d + - VREFA VREFB V5()¶ 100 k: 100 k: 1.95 M: 2 M: Internal 14V LDO Regulator RGP VCM SENSE RGN 400 k: 400 k: V to I Converter Difference Amplifier (x5) VSENSE LMP8480, LMP8481 www.ti.com SNVS829A – JUNE 2012 – REVISED AUGUST 2012 Figure 7. LMP8481 Functional Diagram Internally, the voltage on each input pin is converted to a current by the internal precision thin-film input resistors RGP and RGN . A second set of much higher value VCM sense resistors between the inputs provide a sample of the input common mode voltage for internal use by the differential amplifier. VSENSE is applied to the differential amplifier through RGP and RGN. These resistors change the input voltage to a differential current. The differential amplifier then servos the resistor currents through the MOSFETs to maintain a zero balance across the differential amplifier inputs. With no input signal present, the currents in RGP and RGN are equal. When a signal is applied to VSENSE, the current through RGP and RGN are imbalanced and are no longer equal. The amplifier then servos the MOSFETS to correct this current imbalance, and the extra current required to balance the input currents is then reflected down into the two lower 400k Ω “tail” resistors. The difference in the currents into the tail resistors is therefore proportional to the amplitude and polarity of VSENSE. The tail resistors, being larger than the input resistors for the same current, then provide voltage gain by changing the current into a proportionally larger voltage. The gain of the first stage is then set by the tail resistor value divided by RG value. The differential amplifier stage then samples the voltage difference across the two 400K tail resistors and also applies a further gain-of-five and output level-shifting according to the applied reference voltage (VREF). The resulting output of the amplifier will be equal to the differential input voltage times the gain of the device, plus any voltage value applied to the two VREF pins. The resistor values in the schematic are ideal values for clarity and understanding. The table below shows the actual values used that account for parallel combinations and loading. This table can be used for calculating the effects of any additional external resistance. Table 2. Actual Internal Resistor Values RGP and RGN RVCMSENSE RTAIL Differential Amp FB VREFx Resistors Gain Option (each) (each) (each) (each) (each) 20x 98.38k 491.9k 393.52k 1967.6k 98.38k 50x 39.352k 196.76k 393.52k 1967.6k 98.38k 60x 32.793k 172.165k 393.52k 1967.6k 98.38k 100x 19.676k 98.38k 393.52k 1967.6k 98.38k Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LMP8480 LMP8481 |
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