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TOPT12-800C0 Datasheet(PDF) 10 Page - WeEn Semiconductors |
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TOPT12-800C0 Datasheet(HTML) 10 Page - WeEn Semiconductors |
10 / 18 page WeEn Semiconductors TOPT12-800C0 TOPTriac TOPT12-800C0 Product data sheet All information provided in this document is subject to legal disclaimers. © WeEn Semiconductors Co., Ltd. 2018. All rights reserved 22 August 2018 10 / 18 11. Application information TOPTriac is a three terminal device that will plug into existing triac circuits. There are some unique features that must be understood to gain its full benefits. 11.1 The Gate terminal is also a Feedback terminal TOPTriac can be triggered like any normal triac. In this conventional mode, the Gate acts as an input. However, the Gate can also be an output, since it provides voltage signatures that indicate the status of TopTriac. The controlling microcontroller can analyse the feedback and act upon it, according to the needs of the application. 11.2 Normal triggering TOPTriac is triggered with negative gate current and may be triggered from 5 V logic or higher voltage supply with suitable series gate resistor. VGT is higher than for standard triacs, so series gate resistors will be a little lower. For 35 mA IGT and 5 V trigger voltage, the current-limiting resistance will typically be 82 Ω instead of 100 Ω for standard triacs. DC gate triggering is the simplest method that automatically achieves safe latch-off after the over-temperature trip protection has been activated. Alternatively, pulse triggering may be applied to the gate in combination with a low level bleed current (IG(bl)), to sustain the trip condition after the over-temperature trip protection has been activated. 11.3 Over-temperature protection If an overload current or insufficient cooling causes the junction temperature to rise above Ttrip, TOPTriac will disable its gate drive to prevent further conduction before it loses control or becomes damaged. When the over-temperature trip is activated, the Gate-to-Common voltage VG-CM reduces from the VGT to the VG(trip) level (please refer to the VGT and VG(trip) characteristics). Continuous DC gate drive sustains continued safe latch-off even after TOPTriac temperature has dropped below Ttrip. This allows a controlled reset by removing and reapplying gate drive after the fault condition has been removed. Pulsed gate drive, which may be preferred for phase control or for efficiency reasons, is combined with a low level bleed current IG(bI) to sustain latch-off when the over- temperature trip is activated. (Please refer to the IG(bI) limiting values for the minimum and maximum allowable bleed current that may be applied during pulse triggering). 11.4 Resetting after over-temperature As long as continuous gate current is applied after over-temperature trip, TOPTriac will remain deactivated even after the TOPTriac temperature has dropped below Ttrip. This is the safest protection method that allows the removal of the fault condition before controlled reset is implemented. |
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