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LTC6102HVHDD-PBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC6102HVHDD-PBF Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  LTC6102/LTC6102HV 8 6102fb The LTC6102 high side current sense amplifier (Figure 1) provides accurate monitoring of current through a user- selected sense resistor. The sense voltage is amplified by a user-selected gain and level shifted from the positive power supply to a ground-referred output. The output signal is analog and may be used as is or processed with an output filter. Theory of Operation An internal sense amplifier loop forces –INS to have the same potential as +IN. Connecting an external resistor, RIN, between –INS and V+ forces a potential across RIN that is the same as the sense voltage across RSENSE. A corresponding current, VSENSE/RIN, will flow through RIN. The high impedance inputs of the sense amplifier will not conduct this input current, so it will flow through the –INF pin and an internal MOSFET to the output pin. The output current can be transformed into a voltage by adding a resistor from OUT to V–. The output voltage is then VO = V– + IOUT • ROUT. Useful Gain Configurations GAIN RIN ROUT VSENSE AT VOUT = 5V 200 49.9Ω 10k 25mV 500 20Ω 10k 10mV 1000 10Ω 10k 5mV 4990 1Ω 4.99k 1mV Selection of External Current Sense Resistor The external sense resistor, RSENSE, has a significant effect on the function of a current sensing system and must be chosen with care. First, the power dissipation in the resistor should be considered. The system load current will cause both heat dissipation and voltage loss in RSENSE.Asaresult,thesense resistor should be as small as possible while still providing the input dynamic range required by the measurement. Note that input dynamic range is the difference between the maximum input signal and the minimum accurately reproduced signal, and is limited primarily by input DC offset of the internal amplifier of the LTC6102. In addition, RSENSE must be small enough that VSENSE does not exceed the maximum sense voltage specified by the LTC6102 or the sense resistor, even under peak load conditions. As an example, an application may require that the maximum sense voltage be 100mV. If this application is expected to draw 20A at peak load, RSENSE should be no more than 5mΩ. Once the maximum RSENSE value is determined, the minimum sense resistor value will be set by the resolu- tion or dynamic range required. The minimum signal that can be accurately represented by this sense amp is limited by the input offset. As an example, the LTC6102 has a typical input offset of 3μV. If the minimum current is 1mA, a sense resistor of 3mΩ will set VSENSE to 3μV. APPLICATIONS INFORMATION BLOCK DIAGRAM Figure 1. LTC6102/LTC6102HV Block Diagram and Typical Connection V+ VREG 0.1μF V– V– 10V OUT 6102 BD LTC6102/LTC6102HV VBATTERY IOUT VSENSE RSENSE ILOAD ROUT RIN – + L O A D VOUT = VSENSE x ROUT RIN 5k 5k 10V 5V 10V 5V –INS –INF +IN |
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Similar Description - LTC6102HVHDD-PBF |
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