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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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34652 датащи(PDF) 14 Page - Freescale Semiconductor, Inc |
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34652 датащи(HTML) 14 Page - Freescale Semiconductor, Inc |
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14 / 26 page  Analog Integrated Circuit Device Data 14 Freescale Semiconductor 34652 FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES Figure 10. Overcurrent Mode for Less Than 3.0 ms Short Circuit Mode If the current going through the load becomes > 5.0 A, the Power MOSFET is discharged very fast (in less than 10 µs) to try to regulate the current at the ILIM value, and the 34652 is in the overcurrent mode for 3.0 ms. Then it follows the pattern outlined in the Overcurrent Mode paragraph above. DISABLING AND ENABLING THE 34652 When a negative voltage (< 1.8 V below VPWR) is applied to the DISABLE pin for more than 1.0 ms (Point A in Figure 11), the 34652 is disabled, the Power MOSFET turns off, and the power good output signals deactivate. The 34652 stays in this state until the voltage on the DISABLE pin is brought to within ±1.2 V of VPWR for more than 1.0 ms to enable the device (Point B in Figure 11). Then a new start-up sequence initiates as described on page 12. Applying a positive voltage (> 1.8 V above VPWR) would also disable the 34652 in the same manner. Figure 11. Disabling and Enabling the 34652 Figure 12 demonstrates that the 34652 must be enabled for the length of the start-up timer to start turning on the Power MOSFET. After the fourth disable signal, the 34652 was enabled for the length of the start-up timer. And because the retry counter is less than 10, the 34652 turns on the Power MOSFET and starts the charging process (refer to the Charging Process section, pages 12–13). Figure 12. Start-Up Timer Versus Disable |
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