NCP1246_15 Datasheet, PDF (34/39 Pages) ON Semiconductor – Fixed Frequency Current Mode Controller

NCP1246
PROTECTION MODES AND THE LATCH MODE RELEASES
Event
Timer Protection
Next Device Status
Overcurrent
V_ILIM > 0.7 V
Fault timer
Latch
Maximum on time
Fault timer
Latch
Winding short
V_sense > V_CS(stop)
Low supply
V_CC < V_CC(off)
External OTP, OVP
High supply
V_CC > V_CC(ovp)
Brown−out
V_HV < V_HV(stop)
Internal TSD
Off mode
V_FB < V_OFF
Immediate reaction
Latch
10 ms timer
Latch
55 ms (35 ms at 100 kHz)
10 ms timer
HV timer
10 ms timer
150 ms timer
Latch
Latch
Device stops
Device stops, HV start−up
current source stops
Device stops and internal
V_CC is turned off
Release to Normal Operation Mode
Autorecovery – B version
Brown−out
V_CC < V_CC(reset)
Autorecovery – B version
Brown−out
V_CC < V_CC(reset)
Autorecovery – B version
Brown−out
V_CC < V_CC(reset)
Autorecovery – B version
Brown−out
V_CC < V_CC(reset)
Brown−out
V_CC < V_CC(reset)
Brown−out
V_CC < V_CC(reset)
(V_HV > V_HV(start))&( V_CC > V_CC(on))
(V_HV > V_HV(start)) & ( V_CC > V_CC(on)) &
TSDb
(V_HV > V_HV(start)) & ( V_CC > V_CC(on)) &
( V_FB > V_ON)
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