Data Sheet

FAN7093_F085
High Current PN Half Bridge
December 2011
deactivate both switches, the  pin has to be set to low. No external driver is needed. The
FAN7093_F085 can interface directly with a microcontroller, as long as the maximum ratings are not
exceeded.
7.3.2 Dead Time Generation
The dead time is generated on the control IC to prevent shoot through between the power MOSFETS.
The dead time is almost independent of the selected slew rate in order to reach a high PWM frequency
of 60kHz
7.3.3 Adjustable Slew Rate
In order to optimize electromagnetic emission, the switching speed of the MOSFETs is adjustable by
an external resistor. The slew rate pin SR allows the user to optimize the balance between emission
and power dissipation within the application by connecting an external resistor R
SR
to GND. If the SR
pin is open by design or if the intermittent disconnect happens, the slew rate is set to the value shown
in table on page 8 rows 7.1.1, 7.1.9.
7.3.4 Status Flag Diagnostic with Current Sense Capability
The status pin IS is used as a combined current sense and error flag output. In normal operation
(current sense mode), a current source, in the control IC is connected to the status pin, which delivers a
current proportional to the forward load current flowing through the active high-side or low-side
MOSFET. Current flow in the reverse direction cannot be detected except for a marginal leakage
current I
IS(LK)
. The external resistor R
IS
determines the voltage per output current. The current sense
ratio is 1/8500 (see table on page 15 for details). In case of a fault condition the status output is
connected to a current source which is independent of the load current and provides I
IS(lim)
. The
maximum voltage at the IS pin is determined by the choice of the external resistor and the supply
voltage. In case of current limitation the I
IS(lim)
is activated for 2 * t
CLS
.
FAN7093_F085 Rev. C1 www.fairchildsemi.com12