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NCP1239 Datasheet(PDF) 36 Page - ON Semiconductor

Part No. NCP1239
Description  Low−Standby High Performance PWM Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1239 Datasheet(HTML) 36 Page - ON Semiconductor

 
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NCP1239
http://onsemi.com
36
INFORMATIVE WAVEFORMS
The following plots were obtained using a 150 W application (output 19 V/7 A).
Figure 60. Startup Sequence
The NCP1239 enables the PFC VCC as soon as the FB pin voltage has gone below a threshold (about 2.7 V), that is when the
internal error flag stops being asserted.
Figure 61. Overload Conditions
The feedback voltage goes high and asserts the internal error flag. The Pin 6 timer counts for about 100 ms (Cpin6 = 390 ns)
before shutting down the SMPS. One “VCC cycle over two is skipped” to limit the duty cycle in overload.


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