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LT6107MPS5-TR Datasheet(PDF) 10 Page - Linear Technology |
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LT6107MPS5-TR Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page LT6107 10 6107fb APPLICATIONS INFORMATION power dissipation is 41mW. This amount of power dis- sipation will result in a 10°C rise in junction temperature above the ambient temperature. It is important to note that the LT6107 has been designed to provide at least 1mA to the output when required, and can deliver more depending on the conditions. Care must be taken to limit the maximum output current by proper choice of sense resistor and RIN– and, if input fault con- ditions exist, external clamps. Output Filtering The output voltage, VOUT, is simply IOUT • ZOUT. This makes filtering straightforward. Any circuit may be used which generates the required ZOUT to get the desired filter response. For example, a capacitor in parallel with ROUT will give a lowpass response. This will reduce unwanted noise from the output, and may also be useful as a charge reservoir to keep the output steady while driving a switch- ing circuit such as a MUX or ADC. This output capacitor in parallel with an output resistor will create a pole in the output response at: f RC dB OUT OUT – •• • 3 1 2 = π Useful Equations Input Voltage: VSENSE = IR Voltage SENSE SENSE • G Gain: VOUT V R R SENSE OUT IN = Current Gain: I Transcond OUT I R R SENSE SENSE IN = u uctance: I Transimpedance: V OUT O VR SENSE IN = 1 U UT I R R R SENSE SENSE OUT IN = • Power Supply Connection For normal operation, the V+ pin should be connected to either side of the sense resistor. Either connection will meet the constraint that +IN ≤ V+ and –IN ≤ V+. During normal operation, VSENSE should not exceed 500mV (see VSENSE(MAX) under Electrical Characteristics). This ad- ditional constraint can be stated as V+ – (+IN) ≤ 500mV. Referring to Figure 5, feedback will force the voltages at the inputs –IN and +IN to be equal to (VS – VSENSE). Connecting V+ to the load side of the shunt results in equal voltages at +IN, –IN and V+. Connecting V+ to the supply end of the shunt results in the voltages at +IN and –IN to be VSENSE below V+. If the V+ pin is connected to the supply side of the shunt resistor, the supply current drawn by the LT6107 is not included in the monitored current. If the V+ pin is con- nected to the load side of the shunt resistor (Figure 5), the supply current drawn by the LT6107 is included in the monitored current. It should be noted that in either configuration, the output current of the LT6107 will not be monitored since it is drawn through the RIN resistor connected to the positive side of the shunt. Contact the factory for operation of the LT6107 with a V+ outside of the recommended operating range. Figure 5. LT6107 Supply Current Monitored with the Load Reverse Supply Protection Some applications may be tested with reverse-polarity supplies due to an expectation of the type of fault during operation. The LT6107 is not protected internally from ex- ternal reversal of supply polarity. To prevent damage that may occur during this condition, a Schottky diode should be added in series with V– (Figure 6). This will limit the reverse current through the LT6107. Note that this diode will limit the low voltage performance of the LT6107 by ef- fectively reducing the supply voltage to the part by VD. LT6107 ROUT VOUT 6107 F05 RIN VS LOAD RSENSE V+ V– OUT –IN +IN |
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