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TD350 Datasheet(PDF) 6 Page - STMicroelectronics |
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TD350 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 11 page TD350 Functional Description 6/11 4.8 Fault status output Fault output is used to signal a fault event (desaturation, UVLO) to a controller. The fault pin is designed to drive an optocoupler. 4.9 Undervoltage protection Undervoltage detection protects the application in the event of a low VH supply voltage (during start- up or a fault situation). During undervoltage, the OUTH pin is open and the OUTL pin is driven low (active pull-down for VH>2V, passive pull-down for VH<2V). Fault output signals the undervoltage state and is reset only when undervoltage state disappears. Figure 2: Detailed Internal Schematic VH OUT 2V UVH UVL Vccmin FAULT GND VH VL FAULT VREF 250uA VH DESAT rev. 3 CLAMP OUTH Vref COFF OUTL S2 Comp_DelayOff 2.5V Comp_Input IN 1V-4V Comp_Desat 7.2V LVOFF VH UVLO Vref Control Block 2-level OFF driver Comp_Clamp 2V Delay |
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