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BTS3125EJ Datasheet(PDF) 18 Page - Infineon Technologies AG |
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BTS3125EJ Datasheet(HTML) 18 Page - Infineon Technologies AG |
18 / 45 page Datasheet 18 Rev. 1.0 2016-09-12 HITFET - BTS3125EJ Smart Low-Side Power Switch Protection Functions 6 Protection Functions The device provides embedded protection functions. Integrated protection functions are designed to prevent IC destruction under fault conditions described in the datasheet. Fault conditions are considered as “outside” normal operation. Protection functions are not designed for continuous repetitive operation. 6.1 Over Voltage Clamping on OUTput The BTS3125EJ is equipped with a voltage clamp circuitry that keeps the drain-source (output to GND) voltage VDSat a certain level VOUT(CLAMP). The over voltage clamping is overruling the other protection functions. Power dissipation has to be limited to not exceed the maximum allowed junction temperature. This function is also used in terms of inductive clamping. Please see also Chapter 5.3.1 for more details. 6.2 Thermal Protection The device is protected against over temperature due to overload and / or bad cooling conditions. To ensure this a temperature sensor is located in the power MOSFET. The BTS3125EJ has a thermal protection function with automatic restart. After the device has switched off due to over temperature the device will stay off until the junction temperature has dropped down below the thermal hysteresis “Thermal Protection” on Page 18. Figure 14 Thermal protective switch OFF scenario with thermal restart The device also features a digital feedback on the dedicated status pin. This feedback is latched and can be read out easily by the microcontroller. Please see “Diagnostics” on Page 21 for details on this feedback. 6.3 Short Circuit Protection / Current limitation The condition short circuit is an overload condition to the device. If the load current reaches the limitation value of IL(LIM) the device limits the current and therefore will start heating up. When the thermal shutdown temperature is reached, the device turns off. The time from the beginning of current limitation until the over temperature switch off depends strongly on the cooling conditions. IN 0V 5V t Thermal shutdown t Tj TJ(SD) ΔT J(SD)_HYS Thermal _fault_restart.emf VOUT VBAT t Thermal restart |
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