NCP1377B Datasheet

PMIC - AC DC Converters, Offline Switchers


The NCP1377B combines a true current mode modulator and ademagnetization detector which ensures full borderline/criticalConduction Mode in any load/line conditions together withminimum drain voltage switching (Quasi−Resonant operation). Dueto its inherent skip cycle capability, the controller enters burst modeas soon as the power demand falls below a predetermined level. Asthis happens at low peak current, no audible noise can be heard. ForNCP1377, an internal 8.0 s timer prevents the free−run frequency toexceed 100 kHz (therefore below the 150 kHz CISPR−22 EMIstarting limit), while the skip adjustment capability lets the userselect the frequency at which the burst foldback takes place. ForNC1377B, the internal timer duration is reduced to 3.0 s to allowoperation at higher frequencies (up to 300 kHz).The transformer core reset detection is done through an auxiliarywinding which, brought via a dedicated pin, also enables fastOver Voltage Protection (OVP). Once an OVP has been detected, theIC permanently latches off. The 1377 features a sampling time of4.5 s whereas it is 1.5 s for the B version.The NCP1377 also features an efficient protective circuitrieswhich, in presence of an overcurrent condition, disables the outputpulses and enters a safe burst mode, trying to restart. Once the defaulthas gone, the device auto−recovers. Finally an internal 1.0 msSoft−Start eliminates the traditional startup stress. NCP1377B Features • Free−Running Borderline/Critical Mode Quasi−Resonant Operation• Latched Overvoltage Protection• Auto−Recovery Short−Circuit Protection Via UVLO Crossover• External Latch Triggering, e.g. Via Overtemperature Signal• Current−Mode with Adjustable Skip Cycle Capability• Internal 1.0 ms Soft−Start• Internal Temperature Shutdown• Internal Leading Edge Blanking• 500 mA Peak Current Source/Sink Capability• Under Voltage Lockout Level of 12.5 V (On) and 7.5 V (Min)• Direct Optocoupler Connection• SPICE Models Available for TRANsient Analysis• Internal Minimum TOFF• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHSCompliant NCP1377B Applications • AC−DC Adapters for Notebooks, etc.• Offline Battery Chargers• Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)


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