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BTS50090-1TMA Datasheet(PDF) 9 Page - Infineon Technologies AG |
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BTS50090-1TMA Datasheet(HTML) 9 Page - Infineon Technologies AG |
9 / 27 page Datasheet 9 Rev. 1.0, 2008-02-11 Smart High-Side Power Switch BTS50090-1TMA Power Stages 5 Power Stages The power stage is built by a N-channel vertical power MOSFET (DMOS) with charge pump. 5.1 Input Circuit Figure 4 shows the input circuit of the BTS50090-1TMA. The current source to Vbb ensures that the device switches off in case of open input pin. The zener diode protects the input circuit against ESD pulses. Figure 4 Input Circuit A high signal at the required external small signal transistor pulls the input pin to ground. A logic supply current IIN is flowing and the power DMOS switches on with a dedicated slope, which is optimized in terms of EMC emission. Figure 5 Switching a Load (resistive) 5.2 Output On-State Resistance The on-state resistance R DS(ON) depends on the supply voltage as well as the junction temperature Tj. Figure 6 shows these dependencies for the typical on-state resistance. The voltage drop in reverse polarity mode is described in Section 6.3. IN Rbb I V bb Input.emf VZ,IN VIN I IN V bIN V OUT t SwitchOn.emf t I IN 10% 25% 50% 90% t ON t OFF (dV/dt) ON (dV/dt) OFF |
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