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BTF3035EJ Scheda tecnica(PDF) 19 Page - Infineon Technologies AG |
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BTF3035EJ Scheda tecnica(HTML) 19 Page - Infineon Technologies AG |
19 / 59 page Datasheet 19 Rev. 1.0 2018-08-08 BTF3035EJ Smart Low-Side Power Switch Power Stage 5.6 Adjustable Switching Speed / Slew Rate In order to optimize electromagnetic emission, the switching speed of the MOSFET can be adjusted by connecting an external resistor between SRP pin and GND. This allows for balancing between electromagnetic emissions and power dissipation. Shorting the SRP pin to GND represents the fastest switching speed. Open pin represents the slowest switching speed. The accuracy of the switching speed adjustment is dependent on the precision of the external resistor used and on the parasitic capacitance on the SRP pin. It is recommended to use accurate resistors and place them as close as possible to the SRP pin with the shortest way possible to the GND of the device. Figure 16 shows the simplified relation between the resistor value and the switching times Figure 16 Typical simplified relation between switching time and RSRP resistor values used on SRP pin It is not recommended to change the slew rate resistance during switching (supplied device, VDD > VDD(UV_ON). Undefined switching times can result. If the SRP pin is externally pulled up above the normal SRP pin voltage VSRP (e.g. to VDD) the slowest slew rate settings apply. |
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