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IRSM836-045MA Datasheet(PDF) 11 Page - International Rectifier |
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IRSM836-045MA Datasheet(HTML) 11 Page - International Rectifier |
11 / 19 page IRSM836-045MA 11 www.irf.com © 2013 International Rectifier February 3, 2013 Fault Reporting and Programmable Fault Clear Timer The IRSM836-045MA provides an integrated fault reporting output and an adjustable fault clear timer. There are two situations that would cause the IRSM836-045MA to report a fault via the FAULT pin. The first is an under-voltage condition of VCC and the second is when the ITRIP pin recognizes a fault. Once the fault condition occurs, the FAULT pin is internally pulled to VSS and the fault clear timer is activated. 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 VCC. The length of the fault clear time period (tFLTCLR) is determined by exponential charging characteristics of the capacitor where the time constant is set by RRCIN and CRCIN. In Figure 4 where we see that a fault condition has occurred (UVLO or ITRIP), RCIN and FAULT are pulled to VSS, and once the fault has been removed, the fault clear timer begins. Figure 5 shows that RRCIN is connected between the VCC and the RCIN pin, while CRCIN is placed between the RCIN and VSS pins. Figure 4: RCIN and FAULT pin waveforms Figure 5: Programming the fault clear timer The design guidelines for this network are shown in Table 1. CRCIN ≤1 nF Ceramic RRCIN 0.5 MΩ to 2 MΩ >> RON,RCIN Table 1: Design guidelines The length of the fault clear time period can be determined by using the formula below. ( ) − − = CC TH RCIN RCIN RCIN FLTCLR V V C R t , 1 ln VCC VRCIN Time VRCIN,TH tFLTCLR VSS VFAULT Time VSS ITRIP High Impedance State Vcc HIN (x3) RCIN EN ITRIP VSS FAULT VRx LIN (x3) VB ( x3) VS (x3) IRSM836-045MA I - RRCIN CRCIN |
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