NCP1237_11 datasheet(3/41 Pages) ONSEMI

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NCP1237

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SIMPLIFIED INTERNAL BLOCK SCHEMATIC

Reset

Brown−out

−

blanking

timer

VDD

−

Soft−start Start

Reset

IC Start

IC Stop

Oscillator

VCC

Latch

−

Vskip

Protection

Mode

release

timer

Autorecovery

protection

mode only

DRV

HV sample

OVM

Clamp

UVLO

Fault

Reset

Sawtooth

Jitter

HV stop

Brown−out

HV stop

V to I

HV sample

Latch

Dual HV

start−up

current source

VCC

management

HV current

TSD

VDD

UVLO

Reset

TSD

Start

IC Start

Skip

PWM

Soft−start

Reset

VDD

UVLO

Soft−skip ramp

IC stop

TSD

HV dc

ILIMIT

PWM

Fault Flag

Foldback

GND

Stop

Skip

DMAX

−

blanking

−

blanking

Brown−out

Reset

Latch

Vclamp

blanking

1 kW

Soft−start

end

Soft−start end

End

slope

comp.

Figure 3. Simplified Internal Block Schematic

ramp

IOPC = 0.5m x

(VHV−125)

VDD

INTC

VOVP

VOTP

tLatch(OVP)

tLatch(OTP)

tSSKIP

RFB(up)

KFB

tSSTART

VFB(OPC)

tLEB

tBCS

VCS(tran)

VILIM

ILIMIT

ITRAN

VCS(stop)

ITRAN

DCMAX

DMAX

tfault

ttran

tautorec

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