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12ASX2 Datasheet(PDF) 61 Page - Infineon Technologies AG |
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12ASX2 Datasheet(HTML) 61 Page - Infineon Technologies AG |
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61 / 147 page  EiceDRIVER ™ SIL 1EDI2002AS Protection and Diagnostics Datasheet 61 Rev. 3.1, 2015-07-30 Hardware Description The DESAT function is not active while the output stage is in PWM OFF state. The blanking time needs to be chosen carefully, since the DESAT protection may be de facto inhibited if the PWM ON-time is too short compared to the chosen blanking time. The detection threshold can be selected by configuring bit field SCFG2.DSATL. At turn-off, the DESAT signal is pulled down for the duration of the TTOFF plateau time, and extended by the blanking time once the hard turn off sequence is initiated. Figure 3-2 DESAT Operation Note: . In case the DESAT pin is open, the pull-up resistance ensures that a DESAT event is generated at the next PWM turn-on command. DESAT Clamping during turn-off The internal pull-up resistance may lead to the unwanted charging of the DC-link capacitance via the DESAT pin. In order to overcome this, the DESAT function needs to be activated by clearing bit SCFG.DSTCEN. When this bit is set, pin DESAT is internally clamped to GND2 when a PWM off command is issued by the device. VTON / VTOFF VEE2 VDESAT VCC2 0V time time tTTOFF VCC2 tBLANK tBLANK |
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