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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9800 датащи(PDF) 28 Page - STMicroelectronics |
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L9800 датащи(HTML) 28 Page - STMicroelectronics |
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28 / 55 page  7 Power stages The device is an 8-channel low-side relay switch. The power stages are made by N-channel Power MOSFET transistors. The source of the power transistors must be directly connected to the GND pin potential. An unwanted OV detection may happen when a different voltage is applied. 7.1 Operating modes The RDS(ON) (on-state resistance) depends on the TJ (junction temperature) and on the supply voltage. 7.1.1 Switching resistive loads In the case of resistive loads switching, refer to the following switching times and slew rates. Figure 20. Switching resistive load VDS t tON tOFF t % of 90 VS d V / d tON % 70 d V/ d tOFF % 30 tDELAY(ON) tDELAY(OFF) INn/ OUT.OUTn 70% ofVS 30% ofVS 10% ofVS 7.1.2 Inductive output clamp The inductance still drives the current the voltage across the power switch increases until reaching VDS(CL) in case of switching off inductive loads. The voltage clamping is necessary to prevent device destruction and protects the device in all operative modes. The maximum allowed load inductance is limited by the max energy. The clamping structure preserves the device in all the operating states: sleep, idle, active, and limp-home (see the Figure 21). Figure 21. Output clamp concept DRAIN SOURCE Configurable channel VDS(CL) Control Logic L9800 Power stages DS14041 - Rev 2 page 28/55 |
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