NCP1255 查看數據表（PDF） - ON Semiconductor

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NCP1255

Current-Mode PWM Controller for Off-line Power Supplies featuring Peak Power Excursion

ON Semiconductor 

NCP1255

OPP

Vlatch

BO

VBO1

VBO2

600−ns time

constant

OVP

gone?

Up counter

RST

4

S

Q

Q

R

Power on

reset

Jitter mod.

BO

Vcc and logic

management

UVLO

double hiccup

Vdd power

VOVP on reset

100% to

25% change

SC

Vcc

Vref

Vcc

20 ms

option

latch/AR

Upper

/ lower

limit

1−ms

blanking

IpFlag, PON reset

Rlimit

65 kHz

clock

S

Q

Q

Clamp

R

Frequency

increase to

130 kHz

Frequency

foldback

VFswp

Vskip

Vfold

Timer

Vcc

Drv

vdd

RFB

/4

FB

CS

VSC

LEB

Rramp

SC

The soft−start is

activated during:

4 ms

SS

Ip flag

− the startup sequence

− the auto−recovery burst mode

VFB < 1 V ? setpoint = 250 mV

VOPP

250 mV

peak current

freeze

Vlimit + VOPP

+

Vlimit

Figure 2. Internal Circuit Architecture

GND

http://onsemi.com

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