NCP1288BD65R2G datasheet(3/32 Pages) ONSEMI

Part #	NCP1288BD65R2G

Description	Fixed Frequency Current Mode Controller for Flyback Converters

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1288

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3

SIMPLIFIED INTERNAL BLOCK SCHEMATIC

Figure 3. Simplified Internal Block Schematic

Reset

Brown−out

CS

FB

−

+

blanking

timer

VDD

−

+

−

+

−

+

S

R

Q

Soft−start Start

Reset

IC Start

IC Stop

Oscillator

HV

VCC

Latch

−

+

Vskip

Protection

Mode

release

timer

Autorecovery

protection

mode only

DRV

HV sample

OVM

BO

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

PWM

Fault Flag

Foldback

FB

GND

FB

Stop

Skip

S

R

Q

blanking

−

+

S

R

Q

−

+

blanking

Brown−out

Reset

Latch

Vclamp

blanking

1 kW

+

Soft−start

end

Soft−start end

End

slope

comp.

ramp

IOPC = 0.5m x

(VHV−125)

VDD

INTC

VOVP

VOTP

tLatch(OVP)

tLatch(OTP)

tSSKIP

RFB(up)

KFB

ILIMIT

DMAX

tSSTART

VFB(OPC)

tLEB

tBCS

VILIM

ILIMIT

VCS(stop)

DCMAX

DMAX

tfault

tautorec

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NCP1288BD65R2G Datasheet(PDF) 3 Page - ON Semiconductor

NCP1288BD65R2G Datasheet(HTML) 3 Page - ON Semiconductor

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