ncp1239f ON Semiconductor, ncp1239f Datasheet - Page 14

• Manufacturer Part Number: ncp1239f
• Description: Lowstandby High Performance Pwm Controller
• Manufacturer: ON Semiconductor

16.4V
11.2V
DRV
6.9V
Vcc
4.3V
1.8V
3.0V
*This time is programmed by the Pin 6 capacitor. C
0.9 V
Error flag
More generally, the times approximately depend on C
PFC off
− Soft−Start Time (T
− Jittering Period (T
− Fault Detection Delay (T
− T
− T
− T
Fb is ok
fmax
ss
jittering
delay
Fault not confirmed
= 7.5 ms * C
=100 ms * C
100ms*
=10 ms * C
pin6
jittering
ss
fmin
pin6
pin6
):7.5 ms
/ 390 nF
Fault occurs here
/ 390 nF
/ 390 nF
): 10 ms
delay
10ms* Jittering
Figure 33. Fault Management
): 100 ms
Fault Management
PFC on
http://onsemi.com
NCP1239
14
pin6
pin6
= 390 nF nearly sets the following intervals:
Fault confirmed
0.9 V
Error flag
as follows:
100ms*
Reset at UVLO
(Over−Load)
OVL signal
PFC off
0.9 V
Error flag
New Startup
attempt