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BTS7020-2EPA Folha de dados(PDF) 22 Page - Infineon Technologies AG |
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BTS7020-2EPA Folha de dados(HTML) 22 Page - Infineon Technologies AG |
22 / 58 page Data Sheet 22 Rev. 1.00 2017-08-24 BTS7020-2EPA PROFETTM+2 Power Stages Figure 16 Switching a Resistive Load 7.2.2 Switching Inductive Loads When switching OFF inductive loads with high-side switches, the voltage VOUT drops below ground potential, because the inductance intends to continue driving the current. To prevent the destruction of the device due to overvoltage, a voltage clamp mechanism is implemented. The clamping structure limits the negative output voltage so that VDS = VDS(CLAMP). Figure 17 shows a concept drawing of the implementation. The clamping structure protects the device in all operation modes listed in Chapter 6.1. Figure 17 Output Clamp concept IN t VOUT VIN(TH) (dV/dt)ON VIN(HYS) PDMOS t t PowerStage_SwitchRes.emf EON EOFF tON tON(DELAY) tOFF(DELAY) -(dV/dt)OFF tOFF 10% of VS 90% of VS 70% of VS 30% of VS 30% of VS 70% of VS PowerStage_Clamp_INTDIO.emf High-side Channel VS L, RL VOUTn IL VDS(CLAMP) IL VS OUTn VDS GND VS(CLAMP) IS VIS(CLAMP) |
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