Datenblatt-Suchmaschine für elektronische Bauteile |
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FAN3240 Datenblatt(PDF) 14 Page - ON Semiconductor |
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FAN3240 Datenblatt(HTML) 14 Page - ON Semiconductor |
14 / 21 page © 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN3240 • Rev. 1.0.2 13 Another aspect of protecting the integrity of the system is to ensure that a new command cannot be received and executed until the previous command execution is finished. Figure 24. Exclusion of Overlapping Commands Figure 24 illustrates the operation of the FAN324x with overlapping commands. The IN2 input signal is being received while the previous command on channel one is still being executed. It is signified by the fact that OUT1 is still LOW when the rising edge of the IN2 signal arrives. Because the previous command is still active, the IN2 signal is discarded by the input protection logic of the FAN324x. That means that once the FAN324x is committed to an output pulse, it ignores the other input (except the EN input, which is the most dominant input of the device). c) XOR Input Protection The XOR protection implemented in the FAN324x devices prohibits output pulses when two qualified input signals have been received at the same time. The XOR protection works when both inputs are asserted together or a second qualified input is received while the first one is being qualified. The two cases of the XOR protection are illustrated in Figure 25 and Figure 26. Figure 25. Simultaneous Insertion of Two Qualified Inputs Figure 26. Overlapping Qualified Inputs Case The XOR protection prevents simultaneous drive signals being delivered to the two coils of the relay and is an important feature of the device. 5. Relay Drive Outputs (OUT1 and OUT2 Pins) The actual relay is driven through the dedicated drive outputs of the FAN324x. These outputs utilize monolithic MOSFET power devices, in an open-drain configuration, which are capable of handling the voltage level and drive current required to energize the relay coils. The typical RDSON resistance of these devices is 0.9 Ω and they are designed for approximately 1 A output currents. Carrying the rated output current continuously through the relay coil and the output transistors of the FAN324x would cause excessive power dissipation in the relay coil as well as in the driver. It is therefore necessary to prevent the outputs to be on continuously. The maximum on-time of the FAN324x outputs is limited by the protection logic circuit. Under no circumstances should the outputs be on longer than the duration specified by the tMAX parameter. Figure 27 demonstrates operation of the output pulse width limiter of the device. Figure 27. Maximum Output Pulse Width Limiting |
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Ähnliche Beschreibung - FAN3240 |
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