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TS1103-50EG6TP 데이터시트(PDF) 10 Page - Touchstone Semiconductor Inc |
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TS1103-50EG6TP 데이터시트(HTML) 10 Page - Touchstone Semiconductor Inc |
10 / 11 page TS1103 Page 10 TS1103DS r1p0 RTFDS 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 techniques for optimal RSENSE power dissipation. 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 recommended. 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 capacitively - 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 injection 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. This rectification of noise signals occurs because all amplifier input stages are constructed with transistors that can behave as high-frequency signal detectors in the same way pn-junction diodes were used as RF envelope detectors in early radio designs. Against common-mode injected noise, the amplifier’s internal common-mode rejection is usually sufficient. To counter the effects of externally-injected noise, it has always been good engineering practice to add external low-pass filters in series with the inputs of a current-sense amplifier. In the design of discrete current-sense amplifiers, resistors used in the external low-pass filters were incorporated into the circuit’s overall design so errors because of any input-bias current-generated offset voltage errors and gain errors were compensated. With the advent of monolithic current-sense amplifiers, like the TS1103, the addition of external low-pass filters in series with the current-sense amplifier’s inputs only introduces additional offset voltage and gain errors. To minimize or eliminate altogether the need for external low-pass filters and to maintain low input offset voltage and gain errors, the TS1103 incorporates a 50-kHz (typ), 2 nd-order differential low-pass filter as shown in the TS1103 ’s Block Diagram. Output Filter Capacitor If the TS1103 is part of a signal acquisition system where its OUT terminal is connected to the input of an ADC with an internal, switched-capacitor track- and-hold circuit, the internal track-and- hold’s sampling capacitor can cause voltage droop at VOUT. A 22nF to 100nF good-quality ceramic capacitor from the OUT terminal to GND forms a low-pass filter with the TS1103 ’s R OUT and should be used to minimize voltage droop (holding VOUT constant during the sample interval. Using a capacitor on the OUT terminal will also reduce the TS1103 ’s small- signal bandwidth as well as band-limiting amplifier noise. PC Board Layout and Power-Supply Bypassing For optimal circuit performance, the TS1103 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 TS1103 should be short and symmetric. Also recommended are a ground plane and surface mount resistors and capacitors. Figure 3: Making PCB Connections to RSENSE. |
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