NCP1237 ONSEMI [ON Semiconductor], NCP1237 Datasheet - Page 31

• Manufacturer Part Number: NCP1237
• Description: Fixed Frequency Current Mode Controller for Flyback Converters
• Manufacturer: ONSEMI [ON Semiconductor]

Controller Operation (Latched Version: A Option)
S Brown-out
S VCC reset
Latch
S Brown-out
S HV OVP
S TSD
S High Latch
S Low Latch
Figure 29. Controller Operation State Diagram (Latched Overload Protection)
Stopped
S High Latch
S Low Latch
With Fault =
Soft−skip
S Brown-out
S HV OVP
S TSD
V
CC
S Brown-out
S HV OVP
S TSD
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> V
S Soft-skip ends
S V
CC(on)
S t
S V
S V
31
FB
fault
CS
CC
Skip out
> V
Skip
or t
> V
< V
FB(fold)
tran
CS(stop)
CC(off)
S Low Latch
expires
S Fault
S High Latch
Skip in
S Brown-out
S HV OVP
S TSD
High Latch
Running
Soft−start
S Brown-out
S HV OVP
S TSD
Soft-start ends