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Current-Slide3

This slide shows the operation of a current limit switch. When the switch is first turned on, there is typically a high current running through it in order to charge the output capacitors as observed in Figure 1. Blanking time circuitry is usually built into current limit switches to disable current monitoring for a period of time after turn on, preventing the part from shutting down due to false overcurrent conditions. Once the blanking time interval is passed, the current through the switch is monitored. Thereafter, if the switch current exceeds the maximum current in either direction, the switch shuts OFF and a FLAG is asserted as depicted in Figure 2.

PTM Published on: 2010-12-07