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BTF3050EJ Scheda tecnica(PDF) 22 Page - Infineon Technologies AG |
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BTF3050EJ Scheda tecnica(HTML) 22 Page - Infineon Technologies AG |
22 / 59 page Datasheet 22 Rev. 1.0 2018-08-08 BTF3050EJ Smart Low-Side Power Switch Protection Functions Figure 17 Thermal protective switch OFF scenario for case of overload or short circuit Note: For better understanding, the time scale is not linear. The real timing of this drawing is application dependant and cannot be described. 6.3 Overcurrent Limitation / Short Circuit Behavior BTF3050EJ provides a smart overcurrent limitation intended to protect against short circuit conditions while allowing also load inrush currents higher than the current limitation level. It has a current limitation level IL(LIM) which is triggered by a higher trigger level IL(LIM)TRIGGER. If the load current IL reaches the current limitation trigger level IL(LIM)TRIGGER, the internal current limitation will be activated and the device limits the current to a lower value IL(LIM). The IL(LIM)TRIGGER function has a latch behaviour, it happens once and is disabled until it is reset. Then, BTF3050EJ behaves as a normal auto-restart, current limiting device: It keeps heating up at IL(LIM) until the thermal shutdown temperature TJ(SD) is reached, then it turns off. Due to autorestart feature, the MOSFET turns on again after it drops in temperature below thermal hysteresis (∆TJ_HYS). If fault situation is still present, the current will be limited to IL(LIM) as the trigger feature is now disabled. The time to over temperature switch off strongly depends on the cooling conditions. To reset the IL(LIM)TRIGGER level feature, two conditions are necessary. The STATUS pin needs a pull-up signal (VSTATUS ≥ VSTATUS(RESET)) for a minimum duration of tRESET, and the IN pin must be in low state (VIN ≤ VIN(L)) at the same time. The IL(LIM)TRIGGER level feature can also be reset by setting ENABLE=low. See Chapter 6.4 for an overview of reset conditions. Figure 18 “Short circuit protection via current limitation and thermal switch off , with latched fault signal on STATUS” on Page 23 shows this behavior. |
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