NCP1234 ONSEMI [ON Semiconductor], NCP1234 Datasheet - Page 31

• Manufacturer Part Number: NCP1234
• Description: Fixed Frequency Current Mode Controller for Flyback Converters
• Manufacturer: ONSEMI [ON Semiconductor]

Controller Operation (Autorecovery Version: B Option)
Latch
 t
 TSD
autorec
 VCC reset
Figure 50. Controller Operation State Diagram (Autorecovery Protection)
counting
Stopped
 High Latch
 Low Latch
 V
CC
> V
CC(ovp)
With Fault=
 V
 TSD
CC
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V
< V
CC
> V
CC(off)
 t
 V
31
CC(on)
fault
CS
Skip out
Skip
expires
> V
CS(stop)
 V
 High Latch
 Low Latch
CC
> V
 V
 TSD
 High Latch
 V
Skip in
CC(ovp)
CC
CC
Running
> V
< V
CC(ovp)
Soft− start
CC(off)
 V
 Fault
 TSD
CC
< V
CC(off)
Soft−start ends