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AN436 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN436 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 9 page 7/9 AN436 APPLICATION NOTE In practice the area of the pulse has to be lower than 60 or 70% of the maximum voltage.time product Vo.to. The maximum pulse duration in the output is: These two formulæ allow us to define the pulse transformer according to the triac sensitivity. Example: Numerical application with a transformer having the following characteristics: N2/N1 = 1 RP = 0.6Ω LP = 2.5mH Vo.to = 250Vµs Triac: BTA08-700CW IGT = 35mA; VGK = –2V at IG = 2IGT (quadants II and III) diode: VF = 0.7V Power supply: U = 12V; R1 = 100 Ω; tp max = 65µs; IG = 70mA; t = 21µs We have measured: IG = 85 mA at t = 21µs CONCLUSION The pulse transformer provides an excellent method to trigger a triac when galvanic insulation is required. This system is appropriate to microprocessor systems. Nevertheless it needs some precautions to avoid a decrease of the triac commutation behavior. This precaution is achieved by adding a diode in series with the gate. t P 0.7Vo.to V F V GK – ------------------------ = |
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