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NCP1377 - PWM Current-Mode Controller

Description

Pin Symbol Function 1 Demag Core reset detection and OVP 2 FB Sets the peak current setpoint 3 CS Current sense input and skip cycle level selection 4 GND 5 Drv 6 VCC 7 NC 8 HV The IC ground Driving pulses Supplies the IC High voltage pin Description The auxi

Features

  • a sampling time of 4.5 ms whereas it is 1.5 ms 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 auto.
  • recovers. Finally an internal 1.0 ms Soft.
  • Start eliminates the traditional startup stress. Features.
  • Free.
  • Running Borderline/Critical Mode Quasi.
  • Resonant Operation.

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Datasheet preview – NCP1377

Datasheet Details

Part number NCP1377
Manufacturer ON Semiconductor
File Size 640.72 KB
Description PWM Current-Mode Controller
Datasheet download datasheet NCP1377 Datasheet
Additional preview pages of the NCP1377 datasheet.

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Full PDF Text Transcription

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NCP1377, NCP1377B 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 (Quasi−Resonant 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 ms timer prevents the free−run frequency to exceed 100 kHz (therefore below the 150 kHz CISPR−22 EMI starting limit), while the skip adjustment capability lets the user select the frequency at which the burst foldback takes place.
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