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TS1107-20ITQ1633 Scheda tecnica(PDF) 7 Page - Silicon Laboratories |
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TS1107-20ITQ1633 Scheda tecnica(HTML) 7 Page - Silicon Laboratories |
7 / 22 page 2.7.5 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 TS1107/10’s RS+ and RS– terminals are strongly recommended. The drawing below illus- trates the connections between the current-sense amplifier and the current-sense resistor. The pcb layout should be balanced and symmetrical to minimize wiring-induced errors. In addition, the pcb layout for RSENSE should include good thermal management techni- ques for optimal RSENSE power dissipation. Figure 2.4. Making PCB Connections to RSENSE 2.7.6 RSENSE Composition Current-shunt resistors are available in metal film, metal strip, and wire-wound constructions. Wire-wound current-shunt resistors are constructed with wire spirally wound onto a core. As a result, these types of current shunt resistors exhibit the largest self-inductance. In applications where the load current contains high-frequency transients, metal film or metal strip current sense resistors are recommen- ded. 2.7.7 Internal Noise Filter In power management and motor control applications, current-sense amplifiers are required to measure load currents accurately in the presence of both externally-generated differential and common-mode noise. An example of differential-mode noise that can appear at the inputs of a current-sense amplifier is high-frequency ripple. High-frequency ripple (whether injected into the circuit inductively or ca- pacitively) can produce a differential-mode voltage drop across the external current-shunt resistor, RSENSE. An example of externally- generated, common-mode noise is the high-frequency output ripple of a switching regulator that can result in common-mode noise in- jection into both inputs of a current-sense amplifier. Even though the load current signal bandwidth is dc, the input stage of any current-sense amplifier can rectify unwanted, out-of-band noise that can result in an apparent error voltage at its output. Against common-mode injection noise, the current-sense amplifier’s in- ternal common-mode rejection ratio is 130 dB (typ). To counter the effects of externally-injected noise, the TS1107/10 incorporates a 50 kHz (typ), 2nd-order differential low-pass filter as shown in the TS1107/10’s block diagram, thereby eliminating the need for an external low-pass filter which can generate errors in the offset voltage and the gain error. 2.7.8 PC Board Layout and Power-Supply Bypassing For optimal circuit performance, the TS1107/10 should be in very close proximity to the external current-sense resistor and the pcb tracks from RSENSE to the RS+ and the RS– input terminals of the TS1107/10 should be short and symmetric. Also recommended are surface mount resistors and capacitors, as well as a ground plane. TS1107/10 Data Sheet System Overview silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 6 |
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