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| NCP1237_11 Datasheet, PDF (39/41 Pages) ON Semiconductor – Fixed Frequency Current Mode Controller for Flyback Converters | |||
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NCP1237
Controller Operation (Latched Version: A Option)
High Latch
VCC > VCC(on)
Softâstart
Soft-start ends
S Brown-out
S HV OVP
S TSD
S Brown-out
S HV OVP
S TSD
Stopped
S Brown-out
S VCC reset
S High Latch
S Low Latch
Latch
S Brown-out
S HV OVP
S TSD
Skip
S Brown-out
S HV OVP
S TSD
S Brown-out
S HV OVP
S TSD
Skip in
Softâskip
Skip out
Running
S High Latch
S Low Latch
S Soft-skip ends
S VFB> VFB(fold)
S Fault
S High Latch
S Low Latch
With Fault =
S tfault or ttran expires
S VCS > VCS(stop)
S VCC < VCC(off)
Figure 70. Controller Operation State Diagram (Latched Overload Protection)
http://onsemi.com
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