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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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33883 датащи(PDF) 13 Page - Freescale Semiconductor, Inc |
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33883 датащи(HTML) 13 Page - Freescale Semiconductor, Inc |
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13 / 21 page  Analog Integrated Circuit Device Data Freescale Semiconductor 13 33883 FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES OPERATIONAL MODES TURN-ON For turn-on, the current required to charge the gate source capacitor Ciss in the specified time can be calculated as follows: IP = Qg/tr = 80 nC/80 ns ≈ 1.0 A Where Qg is power MOSFET gate charge and tr is peak current for rise time. TURN-OFF The peak current for turn-off can be obtained in the same way as for turn-on, with the exception that peak current for fall time, tf, is substituted for tr: IP = Qg/tf = 80 nC/80 ns ≈ 1.0 A In addition to the dynamic current required to turn off or on the MOSFET, various application-related switching scenarios must be considered. These scenarios are presented in Figure 7. In order to withstand high dV/dt spikes, a low resistive path between gate and source is implemented during the OFF-state. Figure 7. OFF-State Driver Requirement Driver Requirement: Low Resistive Gate- Source Path During OFF-State Flyback spike charges low- side gate via Crss charge current Irss up to 2.0 A. Causes increased uncon- trolled turn-on of low-side MOSFET. Ciss Ciss Crss Crss VBAT Driver Requirement: Low Resistive Gate- Source Path During OFF-State. High Peak Sink Current Capability Flyback spike pulls down high-side source VGS. Delays turn-off of high- side MOSFET. Ciss Ciss Crss Crss VBAT Driver Requirement: High Peak Sink Current Capability Flyback spike charges low- side gate via Crss charge current Irss up to 2.0 A. Delays turn-off of low-side MOSFET. Ciss Ciss Crss Crss VBAT Driver Requirement: Low Resistive Gate- Source Path During OFF-State Ciss Ciss Crss Crss VBAT Flyback spike pulls down high-side source VGS. Causes increased uncon- trolled turn-on of high-side OFF OFF OFF OFF GATE_LS ILOAD L1 ILOAD L1 ILOAD L1 ILOAD L1 Irss VGATE VGATE -VDRN GATE_HS GATE_LS GATE_HS GATE_HS GATE_LS GATE_HS GATE_LS |
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