NCP1246 ONSEMI [ON Semiconductor], NCP1246 Datasheet - Page 33

• Manufacturer Part Number: NCP1246
• Description: Fixed Frequency Current Mode Controller for Flyback Converters
• Manufacturer: ONSEMI [ON Semiconductor]

PROTECTION MODES AND THE LATCH MODE RELEASES
External OTP, OVP
Maximum on time
V
V
sense
V
V
Winding short
V
HV
Internal TSD
CC
Overcurrent
High supply
V
Low supply
CC
Brownïout
ILIM
Off mode
FB
Event
< V
> V
< V
> V
< V
> 0.7 V
HV(stop)
CC(ovp)
CC(off)
CS(stop)
OFF
55 ms (35 ms at 100 kHz)
Immediate reaction
Timer Protection
150 ms timer
10 ms timer
10 ms timer
10 ms timer
Fault timer
Fault timer
HV timer
http://onsemi.com
Device stops, HV startïup
Device stops and internal
NCP1246
Next Device Status
current source stops
V
33
CC
Device stops
is turned off
Latch
Latch
Latch
Latch
Latch
Latch
(V
(V
Release to Normal Operation Mode
(V
HV
HV
HV
> V
> V
Autorecovery – B version
Autorecovery – B version
Autorecovery – B version
Autorecovery – B version
> V
HV(start)
HV(start)
HV(start)
V
V
V
V
V
V
CC
CC
CC
CC
CC
CC
( V
Brownïout
Brownïout
Brownïout
Brownïout
Brownïout
Brownïout
FB
< V
< V
< V
< V
< V
< V
) & ( V
) & ( V
TSDb
)&( V
> V
CC(reset)
CC(reset)
CC(reset)
CC(reset)
CC(reset)
CC(reset)
ON
CC
CC
CC
)
> V
> V
> V
CC(on)
CC(on)
CC(on)
) &
) &
)