Conclusion

AN2777

12/13

Doc ID 14748 Rev 1

4

Conclusion

An innovative high-temperature TRIAC family has been presented. The turn-off capability of

this family of devices is four times higher than previous Snubberless devices. The

performances of a 12 A device have been presented. The turn-off performances have been

specially improved and are far higher than other devices available today.

Such technology can be used to optimize vacuum cleaner design. It has been shown that

such a 12 A device can be used in 2000 W, 230 V vacuum cleaners, whereas 16 A or 25 A

devices were commonly used in the past. This allows the power board price to be reduced.

As these devices are working up to a 150 °C junction temperature, the heatsink size can

also be reduced, leading to another cost reduction.

And above all, the performances of these devices also allow the end-product quality to be

increased. Indeed, time before bad operation can be increased by 50% during jammed

nozzle operation.

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References

1.

“TRIAC turn-off behavior, logic level and Snubberless technologies”, Application Note

AN489, STMicroelectronics.

2.

“RC snubber circuit design”, Application Note AN437, STMicroelectronics.

3.

“SCRs, TRIACs and AC switches: thermal management precautions for handling and

mounting”, Application Note AN533, STMicroelectronics.

4.

“T1235H, T1250H, High Temperature 12 A TRIACs”, datasheet, STMicroelectronics.

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Revision history

Table 2.

Document revision history

Date

Revision

Changes

24-Apr-2009

1

Initial release.