Pwm Current-mode Controller For Free-running Quasi-resonant Operation

The NCP1377 combines a true current mode Modulator and a demagnetization detector which ensures full borderline/critical Conduction Mode in any load/line conditions together with minimum drain voltage switching (QuasiResonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise CAN be heard. For NCP1377 an internal 8.0 s Timer prevents the freerun frequency to exceed 100 kHz (therefore below the 150 kHz CISPR22 EMI starting limit), while the skip adjustment capability lets the user select the frequency at which the burst foldback takes place. For NC1377B, the internal Timer duration is reduced to 3.0 s to allow operation at higher frequencies (up to 300 kHz). The transformer core reset detection is done through an auxiliary winding which, brought via a dedicated pin, also enables fast Over Voltage Protection (OVP). Once an OVP has been detected, the IC permanently Latches off. The 1377 features a sampling time of 4.5 s whereas it is 1.5 s for the B version. The NCP1377 also features an efficient protective circuitries which, in presence of an overcurrent condition, disables the output pulses and enters a safe burst mode, trying to restart. Once the default has gone, the device autorecovers. Finally an internal 1.0 ms SoftStart eliminates the traditional startup stress. By ON Semiconductor
NCP1377B 's PackagesNCP1377B 's pdf datasheet



NCP1377B Pinout, Pinouts
NCP1377B pinout,Pin out
This is one package pinout of NCP1377B,If you need more pinouts please download NCP1377B's pdf datasheet.

NCP1377B Application circuits
NCP1377B circuits
This is one application circuit of NCP1377B,If you need more circuits,please download NCP1377B's pdf datasheet.


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