FAN7093_12 Datasheet, PDF (2/14 Pages) Fairchild Semiconductor – High-Current PN Half-Bridge Driver

Block Diagram
Figure 2. Block Diagram
The FAN7093 is a high-current half-bridge that contains
three separate chips in one package: one P-channel
high-side MOSFET, one N-channel low-side MOSFET,
and with a control IC. All three chips are mounted on
one common lead frame, using chip-on-chip and chip–
by-chip technologies. The power MOSFETs are vertical
MOS transistors to ensure minimum on-state resistance.
Using a P-channel high-side switch eliminates a charge
pump and reduces EMI. A microcontroller is able to
control the logic level inputs of IN and /INH of the half-
bridge. The diagnostic pin IS is a current output stage
that delivers a proportional current through the P-
channel and N-channel MOSFETS, depending on which
is being activated, with the IN or /INH pin forcing
conditions. In case of a short to VBATT or ground, the
IS pin acts as an error flag. The error flag can be
detected as a logic HIGH level through an attached
microcontroller. In an over-current situation, the control
IC turns off the MOSFETs and tries to turn them back
on after a cool down time of 140 μs (typical). The control
IC protects the MOSFETs against over-voltage, under–
voltage, and over–temperature conditions. The dead
time, to prevent shoot-through between the P- and N-
channel MOSFET, is also generated by the control IC.
The slew rate of the outputs can be adjusted through an
external resistor connected to the SR pin. The FAN7093
can be combined with another FAN7093 to form a full-
bridge drive. Multiple FAN7093 can be combined in full-
or half-bridge three-phase drive configurations.
© 2011 Fairchild Semiconductor Corporation
FAN7093 • Rev. 1.0.4
2
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