AN440 datasheet(3/8 Pages) STMICROELECTRONICS

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AN440 Datasheet(PDF) 3 Page - STMicroelectronics

Part #	AN440

Description	QII and QIII TRIAC triggering with positive power supply

PDF	8 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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3 / 8 page

AN440

Gate current pulse width setting

3/8

Gate current pulse width setting

The TRIAC latching current (IL) is the minimum value of the main current which allows the

component to remain in the conducting state after the gate current IG has been removed.

That is to say the gate current has to be higher than IGT until the main current reaches the

latching current.

Example: for most of CW Snubberless TRIACs (refer to datasheet for further information):

Q1 – Q3: IL max = 50 mA

Q2: IL max = 60 mA

Example: for most BW Snubberless TRIACs:

Q1 – Q3: IL max = 70 mA

Q2: IL max = 80 mA

Figure 3.

Gate control principle

Lmax

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