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LTC6102CDD-TR Datasheet(PDF) 10 Page - Linear Technology |
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LTC6102CDD-TR Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LTC6102/LTC6102HV 10 6102fb APPLICATIONS INFORMATION Figure 3. Shunt Diode Limits Maximum Input Voltage to Allow Better Low Input Resolution Without Overranging Selection of External Input Resistor, RIN The external input resistor, RIN, controls the transconduc- tance of the current sense circuit, IOUT = VSENSE/RIN. For example, if RIN = 100, then IOUT = VSENSE/100 or IOUT = 1mA for VSENSE = 100mV. Figure 2. Kelvin Input Connection Preserves Accuracy with Large Load Current and Large Output Current LTC6102 ROUT VOUT 6102 F02 RIN – V+ LOAD RSENSE RIN + V+ –INF V– OUT VREG 0.1μF TIE AS CLOSE TO RIN AS POSSIBLE –INS +IN LOAD V+ V– OUTPUT RSENSE* ROUT LTC6102 RIN – RIN + CREG *VISHAY VCS1625 SERIES WITH 4 PAD KELVIN CONNECTION V– V+ LOAD DSENSE 6102 F03 RSENSE RIN should be chosen to provide the required resolution while limiting the output current. At low supply voltage, IOUT may be as much as 1mA. By setting RIN such that the largest expected sense voltage gives IOUT = 1mA, then the maximum output dynamic range is available. Output dynamic range is limited by both the maximum allowed output current (Note 1) and the maximum allowed output voltage, as well as the minimum practical output signal. If less dynamic range is required, then RIN can be increased accordingly, reducing the output current and power dis- sipation. If small sense currents must be resolved ac- curately in a system that has very wide dynamic range, a smaller RIN may be used if the max current is limited in another way, such as with a Schottky diode across RSENSE (Figure 3). This will reduce the high current measurement accuracy by limiting the result, while increasing the low current measurement resolution. This approach can be helpful in cases where occasional large burst currents may be ignored. Care should be taken when designing the PC board lay- out for RIN, especially for small RIN values. All trace and interconnect impedances will increase the effective RIN value, causing a gain error. It is important to note that the large temperature drift of copper resistance will cause a change in gain over temperature if proper care is not taken to reduce this effect. To further limit the effect of trace resistance on gain, maximizing the accuracy of these circuits, the LTC6102 has been designed with a Kelvin input. The inverting terminal (–INS) is separate from the feedback path (–INF). During operation, these two pins must be connected together. The design of the LTC6102 is such that current into –INS is input bias current only, which is typically 60pA at 25°C. Almost all of the current from RIN flows into –INF, through the LTC6102, and into ROUT via the OUT pin. In order to minimize gain error, –INS should be routed in a separate path from –INF to a point as close to RIN as possible. In addition, the higher potential terminal of RIN should be connected directly to the positive terminal of RSENSE (or any input voltage source). For the highest accuracy, RIN should be a four-terminal resistor if it is less than 10Ω. Selection of External Output Resistor, ROUT The output resistor, ROUT, determines how the output cur- rent is converted to voltage. VOUT is simply IOUT • ROUT. In choosing an output resistor, the max output voltage must first be considered. If the circuit that is driven by the output does not have a limited input voltage, then ROUT |
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