전자부품 데이터시트 검색엔진 |
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TS1102-100 데이터시트(PDF) 7 Page - Touchstone Semiconductor Inc |
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TS1102-100 데이터시트(HTML) 7 Page - Touchstone Semiconductor Inc |
7 / 11 page TS1102 TS1102DS r1p0 Page 7 RTFDS PIN FUNCTIONS PIN LABEL FUNCTION SOT23 5 RS+ External Sense Resistor Power-Side Connection 4 RS- External Sense Resistor Load-Side Connection 1, 2 GND Ground. Connect these pins to analog ground. 3 OUT Output Voltage. VOUT is proportional to VSENSE = VRS+ - VRS- BLOCK DIAGRAM DESCRIPTION OF OPERATION The internal configuration of the TS1102 – a unidirectional high-side, current-sense amplifier - is based on a commonly-used operational amplifier (op amp) circuit for measuring load currents (in one direction) in the presence of high-common-mode voltages. In the general case, a current-sense amplifier monitors the voltage caused by a load current through an external sense resistor and generates an output voltage as a function of that load current. Referring to the typical application circuit on Page 1, the inputs of the op-amp-based circuit are connected across an external RSENSE resistor that is used to measure load current. At the non-inverting input of the TS1102 (the RS+ terminal), the applied voltage is ILOAD x RSENSE. Since the RS- terminal is the non-inverting input of the internal op amp, op-amp feedback action forces the inverting input of the internal op amp to the same potential (ILOAD x RSENSE). Therefore, the voltage drop across RSENSE (VSENSE) and the voltage drop across RGAIN (at the RS+ terminal) are equal. To minimize any additional error because of op-amp input bias current mismatch, both RGAINs are the same value. Since the internal p- channel FET’s source is connected to the inverting input of the internal op amp and since the voltage drop across RGAIN is the same as the external VSENSE, op amp feedback action drives the gate of the FET such that the FET’s drain- source current is equal to: S VSE SE R A |
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유사한 설명 - TS1102-100 |
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