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NCP1239VDR2G Datasheet(PDF) 14 Page - ON Semiconductor

Part # NCP1239VDR2G
Description  Low?뭆tandby High Performance PWM Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1239VDR2G Datasheet(HTML) 14 Page - ON Semiconductor

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NCP1239
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14
Figure 33. Fault Management
10ms* Jittering
100ms*
fmax
fmin
0.9 V
Error flag
16.4V
11.2V
Fb is ok
Fault occurs here
6.9V
OVL signal
(Over−Load)
DRV
Vcc
Reset at UVLO
Fault not confirmed
PFC off
PFC on
1.8V
3.0V
4.3V
PFC off
100ms*
Fault confirmed
New Startup
attempt
0.9 V
Error flag
0.9 V
Error flag
Fault Management
*This time is programmed by the Pin 6 capacitor. Cpin6 = 390 nF nearly sets the following intervals:
− Soft−Start Time (Tss):7.5 ms
− Jittering Period (Tjittering): 10 ms
− Fault Detection Delay (Tdelay): 100 ms
More generally, the times approximately depend on Cpin6 as follows:
−Tss = 7.5 ms * Cpin6 / 390 nF
−Tjittering =10 ms * Cpin6 / 390 nF
−Tdelay =100 ms * Cpin6 / 390 nF


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