HT33091
The capability of handling high voltages on power line attributed to
transient commutation of loads in conditions of automobile
exploitation.
Load of microcircuit is a device on the base of MOS transistors that
enables switching high current levels in automobile electrical
system. Microcircuit has Fault indication output when there is short
circuit in load or when load transistor current level exceeds preset
value.
Functions
Microcircuit provides pumping of charge (on output capacity on pin Gate of gate control)to drive power MOS transistor. Input Input , compatible with logic levels of CMOS microcircuits ,controls pumping of charge (switch in/switch off).
Check of drain-source voltage is implemented (VDS) on power МОS transistor, detection of shorted load , presentation of error signal on pin Fault.
Microcircuit has pin VT of timer, that is both input in timer window comparators and output of current square circuit, depending on r m s voltage drain-source on power MOS transistor, as power dissipated in МОS device is proportional to VDS2.
External resistor RT and capacitor CT, connected to timer pin enable programming of timing data necessary for protection of power MOS-device.
Internal circuit of stabilizer diodes with the total break down voltage of about 30V provides protection of microcircuit and power МОS transistor from supply voltage value to be exceeded. Activation of microcircuit Zener stabilizer diodes attributed to switching-off МОS transistor for the time when supply voltage value exceeded , in addition pin Fault does not change its logic state .
Features.
Works with a wide variety of N-channel power field transistors
Input of control compatible with CMOS logic
Built in pumping of charge without external components
Detection and protection from shorted load and current exceeding
Failure unit reporting a FET overcurrent and shorted load condition
Possibility to connect induced loads
Forward overvoltage and battery polarity reverse protection Extended range of operating temperatures