TECHNICAL DATA
Powerful High-grade FET driver
Description of basic functions.
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.
KK33091A
ORDERING INFORMATION
KK33091AN
Plastic
KK33091AD
SOIC
T
A
= -40擄 to 125擄 C
for all packages.
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
袦袨S
transistor, detection of
shorted load , presentation of error signal on pin
Fault.
Microcircuit has pin
V
T
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
袦袨S
device is proportional to VDS
2
.
External resistor R
T
and capacitor C
T
, 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
袦袨S
transistor from supply voltage value to be exceeded.
Activation of microcircuit Zener stabilizer diodes attributed to switching-off
袦袨S
transistor for the
time when supply voltage value exceeded , in addition pin Fault does not change its logic state .
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