These are the source (emitter) pins of the low-sidepower MOSFETs (IGBTs). For current detection, the LS1,LS2, and LS3A (LS3B) pins should be externallyconnected to shunt resistors, RSx. In actual applications,use either of the LS3A or LS3B pin because they areinternally connected.When connecting a shunt resistor, use a resistor withlow inductance, and place it as near as possible to the ICwith a minimum length of traces to the LSx and COMxpins. The LSx pin may be prone to negative potential dueto high inductance, which is mainly caused by longercircuit traces; as a result, circuit malfunctions tend tooccur. To avoid such malfunction, design yourapplication so that PCB traces will have inductance aslow as possible. In applications where long PCB tracesare required, add a fast recovery diode, DRSx, between theLSx and COMx pins in order to prevent the IC frommalfunctioning. Do not design an application where theLSx Pin Voltage (Surge), VLS(SURGE), decreases to −4 V orless.