參數(shù)資料
型號: NCP1239
廠商: ON SEMICONDUCTOR
英文描述: Low−Standby High Performance PWM Controller
文件頁數(shù): 36/38頁
文件大?。?/td> 1145K
代理商: NCP1239
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 V
CC
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 (C
pin6
= 390 ns)
before shutting down the SMPS. One “V
CC
cycle over two is skipped” to limit the duty cycle in overload.
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