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2.4 Fault-Out ( FO ) and Over-Current Protection
FAN73892 provides an integrated fault output ( FO ) and
an adjustable fault-clear timer (t FLTCLR ). There are two
situations that cause the gate driver to report a fault via
the FO pin. The first is an under-voltage condition of
low-side gate driver supply voltage (V DD ) and the
second is when the current-sense pin (CS) recognizes a
fault. If a fault condition occurs, the FO pin is internally
pulled to COM, the fault-clear timer is activated, and all
outputs (HO1, 2, 3 and LO1, 2, 3) of the gate driver are
turned off. The fault output stays LOW until the fault
condition has been removed and the fault-clear timer
expires. Once the fault-clear timer expires, the voltage
on the FO pin returns to pull-up voltage.
The fault-clear time (t FLTCLR ) is determined by an internal
C RCIN × V RCIN , TH
current source (I RCIN =5 μ A) and an external C RCIN at the
RCIN pin, as shown as:
t FLTCLR = [ s ] (1)
I RCIN
The R DSRCIN of the MOSFET is a characteristic
discharge curve with respect to the external capacitor
C RCIN . The time constant is defined by the external
capacitor C RCIN and the R DSRCIN of the MOSFET.
The output of current-sense comparator (CS_COMP)
passes a noise filter, which inhibits an over-current
shutdown caused by parasitic voltage spikes of V CS .
Figure 42. R CIN and Fault-Clear Waveform Definition
2.5 Recommended C RCIN
Figure 43 shows timing of t CSOFF and t CSFO vs. C RCIN .
It is strongly recommended that the capacitor on R CIN
pin should be less than 5 nF in order to properly protect
power devices in over-current situations.
1200
1100
1000
900
This corresponds to a voltage level at the comparator of
V CSTH+ - V CSHYS = 500 mV - 60 mV =440 mV, where
V CSHYS =60 mV is the hysteresis of the current
comparator (CS_COMP), as shown in Figure 41.
800
700
600
500
400
300
t CSOFF
t CSFO
200
0
1
2
3
4
5
6
7
8
9
10
11
12
C RCIN [nF]
Figure 43. Timing of t CSOFF and t CSFO vs. C RCIN
3. Noise Filter
Figure 41. Over-Current Protection
Figure 42 shows the waveform definitions of RCIN, FO ,
and the low-side driver; which uses a soft turn-off
method when an under-voltage condition of the low-side
gate driver supply voltage (V DD ) or the current-sense pin
(CS) recognizes a fault. If a fault condition occurs, the
FO Pin is internally pulled to COM and all outputs
(HO1,2,3 and LO1,2,3) of the gate driver are turned off.
Low-side outputs decline linearly by the internal sink
current source (I SOFT =40mA) for soft turn-off, as shown
in Figure 42.
? 2011 Fairchild Semiconductor Corporation
FAN73892 ? Rev.1.0.3
3.1 Input Noise Filter
Figure 44 shows the input noise filter method, which has
symmetry duration between the input signal (t INPUT ) and
the output signal (t OUTPUT ) and helps to reject noise
spikes and short pulses. This input filter is applied to the
HINx, LINx, and EN inputs. The upper pair of waveforms
(Example A) shows an input signal duration (t INPUT )
much longer than input filter time (t FLTIN ); it is
approximately the same duration between the input
signal time (t INPUT ) and the output signal time (t OUTPUT ).
The lower pair of waveforms (Example B) shows an
input signal time (t INPUT ) slightly longer than input filter
time (t FLTIN ); it is approximately the same duration
between input signal time (t INPUT ) and the output signal
time (t OUTPUT ).
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