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TOPT12-800C0 Datasheet(PDF) 10 Page - WeEn Semiconductors

No. de pieza TOPT12-800C0
Descripción Electrónicos  TOPTriac
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Fabricante Electrónico  WEEN [WeEn Semiconductors]
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TOPT12-800C0 Datasheet(HTML) 10 Page - WeEn Semiconductors

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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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