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EPC702-QFN16 Datasheet(PDF) 5 Page - Espros Photonics corp |
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EPC702-QFN16 Datasheet(HTML) 5 Page - Espros Photonics corp |
5 / 11 page He epc701/epc703 Current Peak at OUT A short current peak when OUT is turned on, typically generated by a capacitive load, could trigger the short-circuit protection logic. However, if the current peak is shorter than text plus tdel, the over-current peak will be ignored. Make sure that the energy drawn by such a current peak does not destroy the internal/external output transistor. Over-current Reset Sequence If there is a permanent short circuit at OUT, such short circuit will be detected and OUT is turned off. After a waiting time tminOFF, the device tries to turn on OUT again. If the short circuit is still present, OUT is immediately turned off again. This sequence continues until the short circuit is removed or IN goes to LOW or power is turned off. This mode is called self-healing since the device tries to self-heal the short circuit end to switch back into normal operation. As a consequence in the case of a permanent over-current, short current peaks are issued into the load, respectively short. The time tminOFF has to be set to a value that the internal/external switch cannot be damaged by a too high power dissipation. Without an exter - nal switch, the time tminOFF has to be at least 1,000 times longer than the time t del. If one wants to reduce the waiting time in case of a short circuit situation, it can be done by simply taking IN to a low state and then to high again. Please refer to the timing diagram in Figure 5. However, make sure that the maximum power dissipation of the chip or the external switching transistor will never be exceeded above the allowed maximum. © 2011 ESPROS Photonics Corporation Characteristics subject to change without notice 5 Datasheet epc701_703 - V2.2 www.espros.ch Figure 3: Short over-current pulse, i.e., by switching a capacitive load Timing diagram not enough overcurrent epc700 LST V th sens <t del t ext IN OUT STATUS SENS HIGH-Z 05.01.2011 Page 1 ... File: This document is confidential and protected by law and international trades. It must not be shown to any third party nor be copied in any form without our written permission . V DD Figure 4: Over-current reset sequence Timing diagram normal overcurrent release epc700 LST V th sens t del t ext IN OUT STATUS epc701 SHORT SENS t minOFF HIGH-Z 05.01.2011 Page 1 File: This document is confidential and protected by law and international trades. It must not be shown to any third party nor be copied in any form without our written permission . STATUS epc703 0 0 0 V DD t LED HIGH-Z Figure 5: Over-current status reset Timing diagram reset overcurren epc700 Lukas Steinemann V th sens t del t ext IN OUT STATUS SHORT SENS <t minOFF HIGH-Z 05.01.2011 Page 1 ... File: This document is confidential and protected by law and international trades. It must not be shown to any third party nor be copied in any form without our written permission . V DD |
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