IRSM836-025MA

11

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© 2013 International Rectifier

February 3, 2013

Fault Reporting and Programmable Fault Clear Timer

The IRSM836-025MA provides an integrated fault reporting output and an adjustable fault clear timer.

There are two situations that would cause the IRSM836-025MA to report a fault via the FAULT pin. The first is an

low state until the fault condition has been removed and the fault clear timer expires; once the fault clear timer

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.

≤1 nF

Ceramic

0.5 MΩ to 2 MΩ

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

Time

Time

ITRIP

High

Impedance State

HIN (x3)

RCIN

EN

ITRIP

FAULT

VRx

LIN (x3)

IRSM836-025MA