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AUIRS2191S
Negative Vs Safety Operating Area (negVs SOA)
In normal switching operation the Vs node may fall below (i.e. negative) VSS/COM nodes (e.g. because of poor circuit
layout and high dV/dt). This condition should be limited since it could bring to an uncontrolled behavior of the driver.
The negVs SOA identifies the energy of negative Vs pulses which the driver can withstand; pulse energy is identified as
the product of pulse duration by its amplitude. Fig. 7 shows the negVs SOA of AUIRS2191S at T A = -40C, +25°C and
+125C.
Test conditions were VCC=VBS=15V referenced to VSS=COM.
Even though the AUIRS2191S has been designed and tested to withstand these negative VS transient conditions, it is
highly recommended that the circuit designer always limits the negative VS transients as much as possible by careful PCB
layout and component use.
Figure 7: -Vs Transient results
11
www.irf.com
? 2012 International Rectifier
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November 18, 2013
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