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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TS1101-100EG6TP датащи(PDF) 9 Page - Touchstone Semiconductor Inc |
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TS1101-100EG6TP датащи(HTML) 9 Page - Touchstone Semiconductor Inc |
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9 / 11 page  TS1101 TS1101DS r1p0 Page 9 RTFDS The other attribute of the SIGN comparator’s behavior is its propagation delay as a function of applied VSENSE [(VRS+ - VRS-) or (VRS- - VRS+)]. As shown in Figure , the SIGN comparator’s propagation delay behavior is symmetric regardless of current-flow direction and is inversely proportional to VSENSE. APPLICATIONS INFORMATION Choosing the Sense Resistor Selecting the optimal value for the external RSENSE is based on the following criteria and for each commentary follows: 1) RSENSE Voltage Loss 2) VOUT Swing vs. Applied Input Voltage at VRS+ and Desired VSENSE 3) Total ILOAD Accuracy 4) Circuit Efficiency and Power Dissipation 5) RSENSE Kelvin Connections 1) RSENSE Voltage Loss For lowest IR power dissipation in RSENSE, the smallest usable resistor value for RSENSE should be selected. 2) VOUT Swing vs. Applied Input Voltage at VRS+ and Desired VSENSE As there is no separate power supply pin for the TS1101, the circuit draws its power from the voltage at its RS+ and RS- terminals. Therefore, the signal voltage at the OUT terminal is bounded by the minimum voltage applied at the RS+ terminal. Therefore, VOUT(max) = VRS+(min) - VSENSE(max) – VOH(max) and RS NS VO T max GAIN ILOAD max where the full-scale VSENSE should be less than VOUT(MAX)/GAIN at the application’s minimum RS+ terminal voltage. For best performance with a 3.6V power supply, RSENSE should be chosen to generate a VSENSE of: a) 120mV (for the 25V/V GAIN option), b) 60mV (for the 50V/V GAIN option), c) 30mV (for the 100V/V GAIN option), or d) 15mV (for the 200V/V GAIN option) at the full-scale ILOAD current in each application. For the case where the minimum power supply voltage is higher than 3.6V, each of the four full-scale VSENSEs above can be increased. 3) Total Load Current Accuracy In the TS1101 ’s linear region where VOUT < VOUT(max), there are two specifications related to the circuit’s accuracy: a the TS1101’s input offset voltage (VOS(max) = 100μV and b) its gain error (GE(max) = 0.6%). An expression for the TS1101 ’s total error is given by: VOUT = [GAIN x (1 ± GE) x VSENSE] ± (GAIN x VOS) A large value for RSENSE permits the use of smaller load currents to be measured more accurately because the effects of offset voltages are less significant when compared to larger VSENSE voltages. Due care though should be exercised as previously mentioned with large values of RSENSE. 4) Circuit Efficiency and Power Dissipation IR losses in RSENSE can be large especially at high load currents. It is important to select the smallest, usable RSENSE value to minimize power dissipation and to keep the physical size of RSENSE small. If the external RSENSE is allowed to dissipate significant power, then its inherent temperature coefficient may alter its design center value, thereby reducing load current measurement accuracy. Precisely because the TS1101 ’s input stage was designed to exhibit a very low input offset voltage, small RSENSE values can be used to reduce power dissipation and minimize local hot spots on the pcb. 5) RSENSE Kelvin Connections For optimal VSENSE accuracy in the presence of large load currents, parasitic pcb track resistance should be minimized. Kelvin-sense pcb connections between RSENSE and the TS1101 ’s RS+ and RS- terminals are strongly recommended. The drawing in Figure 3 illustrates the connections between |
Аналогичный номер детали - TS1101-100EG6TP |
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Аналогичное описание - TS1101-100EG6TP |
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