NCP1253 Просмотр технического описания (PDF) - ON Semiconductor

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NCP1253

Current-Mode PWM Controller for Off-line Power Supplies

ON Semiconductor 

NCP1253

IpFlag BO

Vcc logic

management

and fault timer

UVLO

vdd

power

on reset

20us time

constant

VOVP

S

Q

Q

Rlim

vdd

R

Power on

Frequency

modulation

reset

65 kHz

100 kHz

clock

S

Q

Q

Clamp

R

Frequency

foldback

Vfold

Vskip

VDD

RFB

FB

/ 4.2

CS

Rramp

The soft−start is activated during:

− the startup sequence

− the auto−recovery burst mode

4 ms

SS

IpFlag

Vlimit

VFB < 1.05 V ? setpoint = 250 mV

LEB

250 mV

peak current

freeze

Figure 2. Internal Circuit Architecture

Vcc

Drv

GND

http://onsemi.com

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