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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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NCP1237 датащи(PDF) 17 Page - ON Semiconductor |
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NCP1237 датащи(HTML) 17 Page - ON Semiconductor |
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17 / 34 page  NCP1237 http://onsemi.com 17 Each time the controller is starting (i.e. the controller was off and starts, or restarts, when VCC reaches VCC(on)), a soft−start is applied: the current sense setpoint is linearly increased from 0 (the minimum level can be higher than 0 because of the LEB and propagation delay) until it reaches VILIM (after a duration of tSSTART), or until the FB loop imposes a setpoint lower than the one imposed by the soft−start (the 2 comparators outputs are OR’ed). Figure 12. Soft−Start Time VFB VFB(fault) Time Soft-start ramp VILIM tSSTART Time CS Setpoint VILIMI VFB takes over soft-start Under some conditions, like a winding short−circuit for instance, not all the energy stored during the on time is transferred to the output during the off time, even if the on time duration is at its minimum (imposed by the propagation delay of the detector added to the LEB duration). As a result, the current sense voltage keeps on increasing above VILIM, because the controller is blind during the LEB blanking time. Dangerously high current can grow in the system if nothing is done to stop the controller. In order to protect against this, an additional comparator is included, that senses when VCS reaches VCS(stop) ( = 1.5 x VILIM ). As soon as this comparator toggles, the controller immediately enters the protection mode (latched or autorecovery according to the chosen option). |
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