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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC623EVB датащи(PDF) 13 Page - Semtech Corporation |
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SC623EVB датащи(HTML) 13 Page - Semtech Corporation |
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13 / 21 page  SC623 13 Over-Temperature Protection The Over-Temperature (OT) protection circuit helps prevent the device from overheating and experiencing a catastrophic failure. When the junction temperature exceeds 160°C, the device goes into thermal shutdown with all outputs disabled until the junction temperature is reduced. All register information is retained during thermal shutdown. Charge Pump Output Current Limit The device also limits the charge pump current at the VOUT pin. When VOUT is shorted to ground, the typical output current limit is 300mA. The current limiting is triggered by an output under-voltage lockout below 2V. The output returns to normal when the short is removed and VOUT is above 2.5V. Above 2.5V, a typical current limit of 300mA applies when the FL current sink is off and a typical current limit of 1A applies when the FL current sink is on. Applications Information (continued) LED Float Detection Float detect is a fault detection feature of the LED current sink outputs. If an output is programmed to be enabled and an open circuit fault occurs at any current sink output, that output will be disabled to prevent a sustained output OVP condition from occurring due to the resulting open loop. Float detect ensures device protection but does not ensure optimum performance. Unused LED outputs must be disabled to prevent an open circuit fault from occurring. |
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