NCP1249AD65R2G Ver la hoja de datos (PDF) - ON Semiconductor

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NCP1249AD65R2G

High-Voltage Current-Mode PWM Controller Featuring Peak Power Excursion and Extremely Low Stand-by Power Consumption

ON Semiconductor 

NCP1249A, NCP1249B

X2

REM

OPP/

Latch

R

X2

timer

REM

timer

Remote

timer

QS

QR

TSD

600 ns time

constant

Vlatch

OVP

gone ?

Up

counter

RST

4

VDD

SQ

Q

R

Resets

if Vcc < 3 V

Frequency

modulation

VHV

HV

Brown−out

HV

startup

BO _OK

BO _bias EN

Vcc management,

logic and fault timer

UVLO

IpFlag

hiccup

Vdd POR

20 s time

constant

VOVP

VCC

Idischarge

1s

blanking

X2 & Vcc discharge

65 kHz

clock

S

Q

RQ

Clamp

Vfold

Vskip

Frequency

foldback

DRV

vdd

RFB

FB

/PWM_ ON

CS

Rramp

4 ms

SS

IpFlag

The soft−start is activated during :

−the startup sequence

−the auto−recovery burst mode

VOPP

Vlimit + VOPP

+

LEB

Vlimit

Figure 2. Internal Circuit Architecture

300 mV

peak

Current

freeze

GND

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