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): 20/38頁
文件大?。?/td> 1145K
代理商: NCP1239
NCP1239
http://onsemi.com
20
*This time is programmed by the Pin 6 capacitor. C
pin6
= 390 nF nearly sets the following intervals:
SoftStart Time (T
ss
):7.5 ms
Jittering Period (T
): 10 ms
Fault Detection Delay (T
): 100 ms
More generally, the times approximately depend on C
pin6
as follows:
T
ss
= 7.5 ms * C
/ 390 nF
T
jittering
=10 ms * C
pin6
/ 390 nF
T
delay
=100 ms * C
pin6
/ 390 nF
Figure 38.
Vcc
PWM
Timer
0.9V
flag
PFC
Vcc
regulation
100ms*
16.4V
11.2V
6.9V
100ms*
100ms*
100ms*
7.5ms*
SS
Shortcircuit
Stby stby is left
Standby
is confirmed
Nom
Pout
Shortcircuit
One Vcc cycle is skipped to
lower the burst mode duty
cycle to typically 5% in
fault conditions.
If the fault had disappeared
the SMPS would recover
normal operation
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