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TS1103-200 датащи(PDF) 7 Page - Touchstone Semiconductor Inc |
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TS1103-200 датащи(HTML) 7 Page - Touchstone Semiconductor Inc |
7 / 11 page TS1103 TS1103DS r1p0 Page 7 RTFDS PIN FUNCTIONS PIN LABEL FUNCTION 1 GND Ground. Connect this pin to analog ground. 2 SIGN Comparator Output, push-pull; SIGN is HIGH for (VRS+ > VRS-) and LOW for (VRS- > VRS+). 3 OUT Output Voltage. VOUT is proportional to VSENSE = (VRS+ - VRS-) or (VRS- - VRS+). 4 RS- External Sense Resistor Load-Side Connection 5 VDD S Comparator External Power Supply Pin; Connect this pin to system’s logic VDD supply. 6 RS+ External Sense Resistor Power-Side Connection BLOCK DIAGRAM DESCRIPTION OF OPERATION The internal configuration of the TS1103 – a bidirectional high-side, current-sense amplifier – is a variation of the TS1100 uni-directional current-sense amplifier. In the design of the TS1103, the input amplifier was reconfigured for fully differential input/output operation and a second low-threshold p- channel FET (M2) was added where the drain terminal of M2 is also connected to ROUT. Therefore, the behavior of the TS1103 for when VRS- > VRS+ is identical for when VRS+ > VRS-. Referring to the typical application circuit on Page 1, the inputs of the TS1103 ’s differential input/output amplifier are connected across an external RSENSE resistor that is used to measure current. At the non- inverting input of the TS1103 (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 = VRS+ - VRS-) and the voltage drop across RGAINA (at the RS+ terminal) are equal. Necessary for gain ratio match, both RGAINA and RGAINB are the same value. Since p-channel M1’s source is connected to the inverting input of the internal op amp and since the voltage drop across RGAINA is the same as the |
Аналогичный номер детали - TS1103-200 |
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Аналогичное описание - TS1103-200 |
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