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L6699D 数据表(PDF) 27 Page - STMicroelectronics |
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L6699D 数据表(HTML) 27 Page - STMicroelectronics |
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27 / 38 page  L6699 Current sensing, OCP and OLP Doc ID 022835 Rev 2 27/38 Figure 20. Soft-start and delayed shutdown upon overcurrent timing diagram (safe- start details are not shown) In applications where continuous operation of the converter is needed even under overload conditions, the delayed shutdown function can be disabled by simply grounding the DELAY pin. If the voltage on the ISEN pin reaches 1.5 V, the second comparator is triggered. Switching is stopped immediately and both the internal switch that discharges CSS and the 350 µA current source on the DELAY pin are forced continuously on. As V(DELAY) equals 3.5 V the 350 µA generator is turned off, so that CDelay is slowly discharged by RDelay. The L6699 restarts when V(DELAY) falls below 0.3 V. |
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