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BTS50020-1TAD 데이터시트(PDF) 26 Page - Infineon Technologies AG |
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BTS50020-1TAD 데이터시트(HTML) 26 Page - Infineon Technologies AG |
26 / 51 page Data Sheet 26 Rev. 1.1 2017-03-28 BTS50020-1TAD Smart High-Side Power Switch Functional Description Figure 22 Reverse Polarity Protection with External Components 5.3.6 Overload Protection In case of overload, high inrush current or short circuit to ground, the BTS50020-1TAD offers several protection mechanisms. Any protective switch OFF latches the output. To restart the device, it is necessary to set IN = LOW for t > tIN(RESETDELAY). This behavior is known as latch behavior. Figure 26 gives a sketch of the situation. 5.3.6.1 Activation of the Switch into Short Circuit (Short Circuit Type 1) When the switch is activated into short circuit, the current will raise until reaching the ICL(0) value. After tOFF(TRIP), the device will turn OFF and latches until the IN pin is set to low for t > tIN(RESETDELAY). Under certain supply undervoltage shutdown conditions (for example VS < VS(EXT,DYN)) the latched fault may be reset. For overload (short circuit or overtemperature), the maximum retry cycle (ffault) under fault condition must be considered. 5.3.6.2 Short Circuit Appearance when the Device is already ON (Short Circuit Type 2) When the device is in ON state and a short circuit to ground appears at the output (SC2) with an overcurrent higher than ICL(0) for a time longer than tOFF(TRIP), the device automatically turns OFF and latches until the IN pin is set to low for t > tIN(RESETDELAY). Under certain supply undervoltage shutdown conditions (for example VS < VS(EXT,DYN)) the latched fault may be reset. 5.3.6.3 Influence of the battery wire inductance The wire between the battery and the VS pin includes typically some parasitic inductance. When the device switches off due to a short circuit event, the energy stored in the line inductance together with the capacitance (either the capacitor placed at VS pin or the internal capacitance between drain and source) could trigger an oscillatory behavior on the supply line at short circuit turn-off (see Figure 23), whose frequency depends on the inductance and capacitance values. RIS -VBAT OUT -IL -IGND -IIS IIN IRVS DOUT GND RVS RIN VS IN IS GND |
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