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If the rising edge set externally by the user occurs before the end of this dead time, it is ignored and results delayed until the end of the dead time. The dead time function is a safety time introduced by the device between the falling edge transition of one driver output and the rising edge of the other output. The interlocking function is a logic operation which sets both the outputs to low level when the inputs are simultaneously active (HIN to high level and LIN to low level). In order to avoid any possible cross-conduction between the power MOSFETs/IGBTs of the half-bridge, the L6390 provides both the dead time and the interlocking functions. The dead time can be set to a wide range of values from hundreds of nanoseconds to a few microseconds. Prevention from cross conduction is ensured by interlocking and programmable deadtime functions.ĭead Time: R8 provided to set the Dead time. Device outputs can sink and source 430 mA and 290 mA respectively. The outputs can be driven by two dedicated logic signals or, alternatively, only one logic signal by connecting the two inputs together. The L6390 is a half-bridge driver with several functions such as externally adjustable deadtime, interlocking, smart shutdown (patented), fault comparator and a dedicated high-performance op-amp for advanced current sensing. This feature is achieved by means of a high voltage DMOS synchronously driven with the low side gate driver. The devices have a driver current capability best suited for home appliance motor driving ratings, and they are also equipped with patented internal circuitry which replaces the external bootstrap diode.

This device can be used in all applications where high voltage shifted control is necessary. From Electronics-lab site describe that t he L6390 is a high voltage half-bridge gate driver. Circuit schematic like in Figure 1 above is High Voltage Half-Bridge With Current Feedback Using L6390.

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