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Overvoltage Protection of Devices and Circuits using TVS ... - SeCoS

Overvoltage Protection of Devices and Circuits using TVS ... - SeCoS

Selecting the optimum

Selecting the optimum device Example: Clamping circuit of a 10 W flyback converter, input voltage 230 V AC , primary peak current 150 mA, MOSFET blocking voltage 1000 V 1. Stand-off voltage of TVS diode V WM ≈√2 x 230 V ≈ 330 V, e. g. 324 V Mains tolerance +10%: √2 x 250 V = 353 V < 360 V = V BRmin √ 2. Clamping voltage of TVS diode (V WM = 324 V): V C = 574 V ⇒ Maximum appearing MOSFET voltage: 574 V + 330 V = 904 V √ 3. Peak pulse current I PPM ≥ 150 mA ⇒ P4KE400C with I PPM = 730 mA √ Steady state power dissipation ~ 500 mW ⇒ P4KE400C with P M(AV) = 1 W √ 4. Alternatively: 2 x SMAJ200A (SMD MiniMELF!) in series 9

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