NCP1246 데이터 시트보기 (PDF) - ON Semiconductor

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NCP1246

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1246

PROTECTION MODES AND THE LATCH MODE RELEASES

Event

Timer Protection

Next Device Status

Overcurrent

VILIM > 0.7 V

Fault timer

Latch

Maximum on time

Fault timer

Latch

Winding short

Vsense > VCS(stop)

Low supply

VCC < VCC(off)

External OTP, OVP

High supply

VCC > VCC(ovp)

Brownïout

VHV < VHV(stop)

Internal TSD

Off mode

VFB < VOFF

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 startïup

current source stops

Device stops and internal

VCC is turned off

Release to Normal Operation Mode

Autorecovery – B version

Brownïout

VCC < VCC(reset)

Autorecovery – B version

Brownïout

VCC < VCC(reset)

Autorecovery – B version

Brownïout

VCC < VCC(reset)

Autorecovery – B version

Brownïout

VCC < VCC(reset)

Brownïout

VCC < VCC(reset)

Brownïout

VCC < VCC(reset)

(VHV > VHV(start))&( VCC > VCC(on))

(VHV > VHV(start)) & ( VCC > VCC(on)) &

TSDb

(VHV > VHV(start)) & ( VCC > VCC(on)) &

( VFB > VON)

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