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FAN3240 Folha de dados(PDF) 15 Page - ON Semiconductor |
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FAN3240 Folha de dados(HTML) 15 Page - ON Semiconductor |
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15 / 21 page  © 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN3240 • Rev. 1.0.2 14 If the input pulse is longer than the maximum on-time listed in the datasheet, the duration of the output pulse width is equal to tMAX. This protection feature works for any event that would produce a longer-than-allowed input command. Figure 27 shows typical cases of receiving a long input signal. In the case of IN1, the input signal is a square wave, but its HIGH state is longer than tMAX. The corresponding OUT1 output is terminated 150 ms after its start time, which is the exact maximum on-time of the FAN3240 device used in the measurement. Figure 27 shows the IN2 input staying HIGH permanently. Similar behavior to the long square wave input case can be observed on the OUT2 output. The drive signal is terminated when the pulse width reaches the tMAX limit. 6. Operating Modes Some aspects of the FAN324x family of relay drivers’ operation can be adjusted through the below factory- configurable parameters: 1. tQUAL: Qualification Time. This is the minimum input pulse width duration recognized as a valid input command. 2. tMAX: Maximum Output Pulse Width. Output pulses are terminated after this time interval even if the input pulse is longer or held in a HIGH state continuously. 3. Output Mode: The FAN324x offers two output pulse generation methods: tOUT = tIN < tMAX. In this mode, the output pulse duration (tOUT) replicates the length of the input pulse (tIN) up to tMAX. tOUT = tMAX. The output is on for a fixed time interval of tMAX, regardless of the input pulse width. The mode of operation has no impact on the qualification requirements or on the maximum output pulse width limiting. In both output operating modes, the qualification requirement must be met (tIN > tQUAL) to produce an output pulse. T able 1. Factory Set Configurations Product tQUAL tMAX OUT Mode FAN3240 15 ms 150 ms tOUT = tIN FAN3241 1 ms 30 ms tOUT = tMAX Contact a Fairchild sales representatives for additional configurations. The parameter tQUAL can be configured between 128 µs and 20 ms. Parameter tMAX can be programmed between 1 ms and 350 ms. The Figure 28 and Figure 29 scope pictures clarify the operation of the FAN3240 device. The configuration options are listed in Table 1. Figure 28. FAN3240 Operation The FAN3240 is configured to produce an output pulse that equals the length of the incoming control signal. As Figure 28 indicates, the incoming signals might not be the same length. They are accurately reproduced at the respective outputs of the device. The delay between the input and output pulses is the qualification time. Further detail of the timing relationship between the input and output pulses are illustrated in Figure 29. Figure 29. Timing Details of FAN3240 Operation The input pulse width received at IN1 is measured by the oscilloscope and can be found under the label P1. The measurement P2 is the length of the output pulse generated by the FAN3240. Note the extremely accurate reproduction of the input pulse duration at the output of the device. The third measurement, labeled P5, is the time between the rising edge of IN_1 and the falling edge of OUT_1 traces. It is the qualification time measured by the oscilloscope. Similar measurements demonstrating the operation of the FAN3241 are shown in Figure 30 and Figure 31. |
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