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AUIRS2336S
Fault Reporting and Programmable Fault Clear Timer
The AUIRS2336S provides an integrated fault reporting output and an adjustable fault clear timer. There are two
situations that would cause the HVIC to report a fault via the FAULT pin. The first is an undervoltage condition of
V CC and the second is if the ITRIP pin recognizes a fault. Once the fault condition occurs, the FAULT pin is internally
pulled to V SS . The fault clear timer is activated only if ITRIP pin recognizes a fault: in this case the fault output stays
in the low state until the fault condition has been removed and the fault clear timer expires; once the fault clear timer
expires, the voltage on the FAULT pin will return to V CC .
The length of the fault clear time period (t FLTCLR ) is determined by exponential charging characteristics of the
capacitor where the time constant is set by R RCIN and C RCIN . In Figure 12 where we see that a fault condition has
occurred (UVLO or ITRIP), RCIN and FAULT are pulled to V SS , and once the fault has been removed, the fault clear
timer begins. Figure 13 shows that R RCIN is connected between the V CC and the RCIN pin, while C RCIN is placed
between the RCIN and V SS pins.
Figure 12: RCIN and FAULT pin waveforms
The design guidelines for this network are shown in Table 3.
C RCIN
R RCIN
Figure 13: Programming the fault clear timer
≤ 1 nF
Ceramic
0.5 M ? to 2 M ?
>> R ON,RCIN
Table 3: Design guidelines
The length of the fault clear time period can be determined by using the formula below.
v C (t) = V f (1-e -t/RC )
t FLTCLR = -(R RCIN C RCIN )ln(1-V RCIN,TH /V CC )
www.irf.com
20
? 2009 International Rectifier
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