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AN302 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN302 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 10 page March 2008 Rev 3 1/10 AN302 Application note Thyristors and TRIACs: holding current - an important parameter Introduction The purpose of this note is to familiarize the users of TRIACs or thyristors with the hypostatic current parameter, IH, also known as the holding current parameter. The importance of this parameter is illustrated by some typical examples. Then a description is given of how to measure it and on its variation with the conditions of use and the sensitivity of the components. This application note discusses only the TRIAC; however, the concepts are also valid for SCRs. Definition To keep an electromechanical relay turned on, it is necessary to have a minimum current circulating in its coil. If the current falls too low the relay would turn off. The same phenomenon can be observed in a TRIAC. This minimum current which keeps the TRIAC conducting is called the hypostatic or holding current, IH. (see Figure 1). Figure 1 below shows the holding current and the gate current pulse, IG, which is applied to the basic TRIAC circuit. After the TRIAC is turned on, a current, IT, flows through it.When the TRIAC current falls below the holding current the TRIAC is blocked and requires another gate pulse before it can turn on again. Figure 1. Current control IT IH t IT IH t www.st.com |
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