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NCP1237 Datasheet(PDF) 31 Page - ON Semiconductor

Part # NCP1237
Description  Fixed Frequency Current Mode Controller for Flyback Converters
PDF  34 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1237 Datasheet(HTML) 31 Page - ON Semiconductor

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NCP1237
http://onsemi.com
31
Controller Operation (Latched Version: A Option)
expires
S V
Figure 29. Controller Operation State Diagram (Latched Overload Protection)
Stopped
Running
S Brown-out
S HV OVP
S TSD
VCC > VCC(on)
S Brown-out
S HV OVP
S TSD
Skip out
With Fault =
S tfault or ttran
CS > VCS(stop)
S VCC < VCC(off)
Soft−start
Soft−skip
S Soft-skip ends
S VFB> VFB(fold)
Soft-start ends
Skip
Skip in
S Brown-out
S HV OVP
S TSD
S Brown-out
S HV OVP
S TSD
S Brown-out
S HV OVP
S TSD
Latch
S Brown-out
S VCC reset
High Latch
S High Latch
S Low Latch
S High Latch
S Low Latch
S Fault
S High Latch
S Low Latch



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