Download the NCP1377B datasheet PDF.
This datasheet also covers the NCP1377 variant, as both devices belong to the same pwm current-mode controller family and are provided as variant models within a single manufacturer datasheet.
General 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
Key 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.
Full PDF Text Transcription for NCP1377B (Reference)
Note: Below is a high-fidelity text extraction (approx. 800 characters) for
NCP1377B. For precise diagrams, tables, and layout, please refer to the original PDF.
NCP1377, NCP1377B PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation The NCP1377 combines a true current mode modulator and a demagnetization detector ...
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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 use
NCP1377B Datasheet
